I recently rebuilt the 454 in my 79 K-10. It is a .060” over 1973 block with a steel crank. Hyper-eutectic Speed-Pro pistons on 502 BBC rods. Compression is 9.7:1. It has 049 heads, Comp Cams hydraulic roller 11-451-8, and roller tip rockers. Factory iron intake, and an Edelbrock Q-Jet carb. HEI...