Hey all, I'm new here if this in the wrong spot please delete it. Anyways so I'm 18yrs old and just picked up a project car, an 84 cutlass supreme, for $500. The body and interior are in decent shape but the motor and trans have pretty much had it. It's the 3.8l v6 and what I think is a th250. Previous owner claims 103,000 original miles, I just can't believe that. The odo has been rolled over so I'm thinking 203k or even 303k, idk. I've included a pic of when I pulled the valve cover and it's absolutely disgusting. Surprisingly the engine still runs(well kinda) and the trans shifts as smooth as butter, apart from leaking fluid from literally everywhere. I'm rambling sorry, anyway my question is what should I do to it once this engine/trans dies, I am going to wait until either of them give out before I go swapping something like a 350/th350 in, mainly as I work part time at a discount store making less than $150 a week lol. So what would be the best option for an engine trans and everything else I would need to have the car running and driving for about $600? From what I've seen the th250 will bolt up to a 307 but most say its not even worth it being so puny, what do yall think? I'd like to stay with either the th250 or the th350 so I won't have to change the driveshaft. As far as my skill level goes, I can do most basic and intermediate things with cars, I've done shocks, struts, brakes, valve cover gaskets, water pumps, timing belts, etc but I've never pulled an engine or trans out of a car. There is a great deal for a running olds 455/turbo 400 combo in my area for $450, if I went that route how would I go about finding motor mounts, and how much would a different driveshaft be? People in my area (middle TN) think that running 350/th350 combos are worth their weight in gold, its not uncommon for one with around 180k miles to be listed for $900-1200. So if I went with a chevy setup my only real option is a 305/th350 setup and those are still going for about $600-700 in running condition. For some reason olds 307s are quite alot cheaper at around $300 in running condition, but I have yet to run across one with a transmission as well. I'm still new at all this old car stuff, I came from the land of V-Tec and jdm, so I'm not sure what to do with a carburetor and vacuum modulated transmissions lol. I am anxious to learn and hopefully have a really cool car to show for it when it's done. If I am not correct with any of my info please correct me, like I said I'm very new to all this. Thanks again.