Most of this depends on what all you're swapping. The block itself should be a straight bolt in, right up to existing tranny, provided it was already a V8 car. You'll need the computer and fuel pump if you keep the fuel injection. You'll have to fit the pump into your tank or build one for it. But the motor itself shouldn't be a problem. As far as the crossmember goes use a stock SBC pan from a similar car, it should all fit fine. If you're going to use the tranny it all depends on what was in the Cutlass to begin with, you may have to modify it some, but it shouldn't be too bad. We just put a newer model SBC and a 700r4 into an '80 or so G body and all we had to do was remount the tranny mount. Pretty straight job.