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It's a 425/455 same as all the others except for intake/exhaust manifolds, oil pan and oil filter adapter, which had to be specific for the front-wheel-drive application. And these parts from other 400/425/455 will bolt right onto it.
Just do us a favor and don't rob a nice Toronado of its big-block.
And yet, the response in Post #3 still applies. Any V8 Toronado motor bolts into a Cutlass by changing the exhaust manifolds, oil filter adapter, and motor mounts. All 307s and 1979-80 350 motors require a RWD flexplate also, since motors bolted to the TH325 and TH325L4 used a smaller than normal diameter flexplate. While they are different, you can retain the FWD oil pan and intake manifold in a RWD application.
And yet, the response in Post #3 still applies. Any V8 Toronado motor bolts into a Cutlass by changing the exhaust manifolds, oil filter adapter, and motor mounts. All 307s and 1979-80 350 motors require a RWD flexplate also, since motors bolted to the TH325 and TH325L4 used a smaller than normal diameter flexplate. While they are different, you can retain the FWD oil pan and intake manifold in a RWD application.
Yes of course, not discounting that; just nice to know what kind of transplant is being considered. It's probably not the case, as not many people would swap a 307 into an early '70s A-body (assumption based on username, and I hate assuming), but if it were, then we're also talking about not a perfect long-block swap, but also swapping carb and distributor.
Some Toronados even had V6s. But I'm probably going extreme, but that's what I get for assuming.
A Tornado engine would be an excellent choice for a swap. Very modern engines for their time and with quite the racing pedigree in South America. And you can tell all your friends that you have a hemi!
