454 bbc or 355 sbc
I have a 1967 Camaro that I have had since 1997. I originally had a rebuilt 454 mech roller in it since I bought it. Well in 2003 I wanted to rebuild the 454 with all forged internals. I had a 383 mech. roller motor sitting on an engine stand so I decided to put it in my Camaro. The 383 ran good with no problems but it just didn't have the low end torque the 454 had. I kept it in my Camaro until I finished rebuilding the 454 and out it came. I put my 454 back in and sold the 383 and don't regret it any. It is no way I could go back to a small block anymore and I have had many Chevies with 350s and 1 400 sbc. This big block is now a 491 ci and will be in the car until I am gone. My advice would be to keep your 454 engine, besides they are getting scarce and the cost of one keeps going up too.