455/TH400 in 79 Cutlass

[tommytpk]

Thanks for all the replies; I figured I was going to have to get a custom or modified driveshaft. I will use the 307 mounts that I already bought, and keep the mounting plates. As far as exhaust goes, I may be able to keep the passenger side manifold, but I'm told the drivers' side will not clear, so I may have to source one from a B body, if my information is correct. I have put myself on a strict budget, so I'm trying to use what I have when I can. I know custom driveshaft and exhaust after the headers are going to be the more pricey items.

 

[Gozer442]

Thanks for all the replies; I figured I was going to have to get a custom or modified driveshaft. I will use the 307 mounts that I already bought, and keep the mounting plates. As far as exhaust goes, I may be able to keep the passenger side manifold, but I'm told the drivers' side will not clear, so I may have to source one from a B body, if my information is correct. I have put myself on a strict budget, so I'm trying to use what I have when I can. I know custom driveshaft and exhaust after the headers are going to be the more pricey items.

Does your passenger manifold look like this?

If so, it should fit... just plug the crossover passage.

 

[tommytpk]

Does your passenger manifold look like this?
View attachment 57694
If so, it should fit... just plug the crossover passage.

No, the Toro 455 was in a motorhome, and had true duals on it. Once I get the motor out and home, I will take a good look at the manifolds, the casting, and figure if I can use both, one, or neither.

 

[buick7332]

No, the Toro 455 was in a motorhome, and had true duals on it. Once I get the motor out and home, I will take a good look at the manifolds, the casting, and figure if I can use both, one, or neither.

You also may issues with the air cleaner when it's time to shut the hood.