Olds 403/Th350 into 88 MCSS

Alright I'm just gathering information right now, and doing some price stacking.

This 403/Th350 is bolted into a 79 trans am right now, and I've come to the point with this trans am where it's just become too much to fix this body right now. I can still go forward with it, but I'd rather jump back on track with my Monte carlo.

So, my first question is will an olds 403 bolt to the motor mounts that are in my 88 MCSS right now? it had a SBC/ 700R4 setup prior, i still have the original cross-member.

Second question, will the Th350 bolt to the MCSS original cross-member?

IF the TH350 will bolt to the original cross-member, I'll need a new driveshaft because the MCSS driveshaft was cut down to fit the 700R4.

I considered doing the work to swap rear ends, but it's too much work right now. The MCSS has the stock posi trac, and the trans am has the stock 8.5 posi trac with 2.19's.

Next question, and i don't know if anybody here can awnser this or not but this would be a deal breaker, i have this set of headers on the 403 right now
http://www.summitracing.com/parts/HOK-3901HKR/
part number : HOK-3901HKR
Will they fit this 403 in my MCSS?
I'm going to call holley and ask if those headers will fit an olds Gbody with a 403, and if they will i'll assume they'll fit in my MCSS.



Now if anybody is wondering why i'm making such a sudden switch
This trans am needs allot of work still that i didn't know about. i mean allot.

My MCSS has a spotless interior and almost perfect body, and NO RUST whatsoever, and i don't think its ever had any rust.
Second, I've got roughly 1500-2000$ worth of Savitske classic and custom suspension parts for my MCSS just sitting in boxs. I've got the stage 2 + suspension setup for the front.


Another added bonus, the trans am weights a good bit more than the MCSS, and this 403 will be running through 3.73 rear gears so it should really go go go.

Actually, the Th350 is almost the same length as the 200R4, and either way i can make it work. I'll either just drill new holes, or get a different crossmember. I could always TRY using the trans ams crossmember.

Engine mounts, if i could use the trans ams mounts that would rock, because i have an extra set brand new in the box. If all else i'll just buy a set of mounts that will bolt in. Welding is out of the option right now. If i could use a set of solids i would haha.

I need to call holley today, and i'm going to post on trans am county. If anybody with an olds 403 out there has ever used hooker headers please post and let me know. As of right now this weekend i'm getting the cars ready to trade places. Thursday i'll be pulling the engine and trans back out of the bird, and getting the mighty monte ready to tow out.

It'll feel so god damn good to see this engine in a car that doesn't need 2/3rd of its body panels replaced. You guys have no idea, this car was a train wreck. It's not bad now, still needs a fender grilles door skin and one quarter panel. I just came do a decision last night, if i don't do something with my MCSS now i won't be able to for along time. I didn't spend all that money on suspension to let it sit in boxs for the next two years.

I appreciate the help guys. I hate to put thees new headers by the waste side, because they cost 300$ but if it's gotta happen, then it's gotta happen. oldsmoletick you're not bursting any bubbles, just saving me a ton of work lol.

I will actually need a set of mounts, so I'll be PMing you.

Like i said, the only crossmembers i have are the MCSS original, which was used for a 200R4, and the trans ams.

Yeah i'm leaving my 7.5 in there.



Alright. Headers aside, I'm going to go through with this.

The first thing i'll need will be motor mounts.

Second, a new set of headers.

Third, if the crossmember i have won't work I'll just make it work by sliding it forward, and drilling new mount holes.