[timothale]

I am not sure when ford retarded the camshaft. I had 75 and later 460's when I worked there, I bought a new one every year, I used to install a new double roller timing chain and gear set at straight up, no retard, the stock timing chains stretch after a few thousand miles. I seems like there were also rocker arm changes made during the production run, I don't remember which year. Ford used different pattern intake manifolds I liked to keep the square one and run a holly. My son still talks about when he was 8 years old and we were in heavy stop and go traffic and a new corvette pulled along side , driving in the parking spots and gravel to get along side at a red lite. I jumped the green lite a second with my van and the corvette couldn't keep up , then I slowed down and he had to stop at a parked car.