If you've read my earlier post, I told you about my '78 Cutlass. Somewhere along the line the original 260 was replaced by a '72-'76 Olds 455. (According to the block number.) It has a loud knocking in the lower front I believe to be a main bearing. It's gotta come out and be replaced. While I'm at it, I want to replace: crank, rod bearings, mains, and seals. I'll check the rest for wear and go from there. (Hey, I'm a poet!) All kidding aside, I want the engine to run the best it can on today's regular gas. I don't need to pull the front end into the air, but I want to make the kid in the pony 5.0 scratch his head when I leave him in the rearview. Any suggestions on low-cost mods? Cam? Carb? The car looks good, solid body, no major rust, but nothing fancy either. We used to call them sleepers "back in the day." Thanks, Dan