I am currently running those 441 heads on a complete top end rebuild, 70 k on it and still going. Cheap everyday fuel with no knocking was the goal.
He is some insight into keeping those on your motor. I am using an Accel Super Coil (55k volts or better, hot spark, hei setup), Pertronix HEI ignition module, Pertronix adjustable vacuum advance unit.
It cost me 300 bucks to have those heads redone, hardened seats, viton positive seals.
It all works together with mostly stock components, Edelbrock Carb and AC R45ts spark plugs on an old bottom end. I had 150 psi compression on all cylinders when done.
I cammed down a bit going 1 step over stock with a Comp Cams Kit #SK12-205-2, My Cam I pulled out with flattened lobes was a Melling MT-2. Which I believe is 2 steps over stock and considered a RV Cam.
Summing it all up with THD350 transmission, 4.10 gears, and just around 5000 grand on the tack its pulling over 100mph with some pedal left to go!!!
And thats on 87 pump ethanol! I figured I ended up doing pretty good for a ??? Shade tree job done by meself and one of my best buds!