Dear Dennis;
Patrick's sells 3 cams for the early engines.
The M4-F is for the pre 1955 engines. The F 298 is an 'all out' upgrade for the pre 1963 engines.
I can't recall the (F-29?) one in the middle, but that's the one you want for max power & a smooth idle. It's best to run the springs, lifters & pushrods that are designed for those cams as well.
Stock springs will 'float' the valves at around 4000 RPM+/- and shimmed ones can 'bottom out' & bend a pushrod.
Also; multi-grade oils don't work well in the early engines, so stay with SAE 30 in mild climates.
Good luck.
