Chris,
I picked up a 91 Caprice Classic cheap like that with hopes of useing it under my 51 extended cab. I've got an article somewhere about modifying perimeter frames from cars to use under old iron. If you want I could scan and email it to you if your thinking that route. The wheelbase front to back is pretty close but I'm not sure on the width. If your not gonna go that route there's ton's of parts you can scavenge off of it, is it a runner? If so It's prob. got a 305 (or 350 if it was a cop car) you can pull and use. I got mine cause a friend bought it on ebay to use the motor, tranny, and electronics for the EFI in his 72 1/2 ton, after that was done he didn't much care for the rest of the car so I got it cheap.
Mongo
