I put a big block Olds 400 in mine. Never had it dyno'd or anything and doubt the hp numbers would be that impressive but it was a torque monster.Big Cutlass fan myself. 1st car was a 1984 Cutlass Calais at 16 years old. 1st thing we did was rip out the 307 and throw in chevy 350 pushing around 425hp or so. I still wish I had that car to this day. Last year a 1984 Cutlass Calais came up for sale locally for 7,900 with only 39,000 original miles but this was a T-Top version with solid hard top behind it, solid black with the 442 wheels from factory as an option. Basically had everything but the 442 badge and the throw shifters they used on them. If I would have had the money that thing would have been coming home with me without a doubt! One day I will have another one..One day!
Damn sounds like we're two peas in a pod. My family has been into cars since cars were created. I've built everything from dirt track to the drag strip. 455s are crazy heavy, put i did put a Pontiac 455 in a long bed 73 C10 once. Sounded mean af wide open. I love Chevy engines, small blocks are light and you can get crazy numbers, but my favs have always been the big blocks. 396, 427, 454. Had a 65 Impala, original 396. Put in a monster cam, the works. Eventually threw rod and it sat in my garage for YEARS. Still have the engine, sold the car.When I was drag racing at Chicagoland Speedway as I lived 15 miles south of there in Wilmington, that engine was bumped up to around 480hp at the rear wheels per the dyno. One of the guys that my dad worked with at Mobil Oil also worked at a engine shop in Indiana that built Nascar engines so he had a hand in helping me build it and acquire parts. Granted I knew how to do it at 8 years old but he helped with the dialing in and setting it all up. When I sold it it was because I was moving to florida so I ripped everything out and sold it as a rolling car for 400 bucks. Sold the engine and what not to a friend who actually still has it although now it is up to over 500hp with a shot of nitrous as well for another 100 or so hp. But the block is on it's last legs as he is now at .60 over with it as I was only at .10. Plus I think he is running longer rods, not sure though.
IF I ever get another one I am going to do it right with a 403 Olds with around the same 480hp w/ 4 speed automatic built to withstand 650hp+ along with 3:55 gears or something that will also work on the highway. Just want to do something different then the same old "go to a chevy small block in a G Body that everyone does!" 455 would just be too much on the car and too damn heavy the 400/403 works just right and setup right they can really make some monster torque like yours did and tons of hp to match it up. I'm betting it was higher then you think it was. But depends on cam/cylinder heads and all that jazz. I ran aluminum cylinder heads which really upped the hp especially at 2.02-1.60 ported and polished matched to the intake.