Idle high

I have the same cam in my Fmla S and I used Rhoades variable duration lifters. They bleed down at idle and pump up by 3500 rpm. I can get mine to idle at 800 rpm.

I am also runnning the MP electronic distributor with one light stock spring and one of the light MP recurve springs with no vacuum advance hooked up to the dist. I run 17° adv at idle and 35 total at 2500 rpm.

Rhoades lifters may help you (more than a cannister). They take out 15° duration and .025" lift at idle. They don't bleed down above 3500 rpm and give the full lift and duration of the cam at high rpm. I have been using them for over 25 years and put over 250, 000 on them without any problems. They work better than the other competitors variable duration lifters.