I replaced Sport roller-tips with full Scorpion 1.5 Roller Rockers & corrected pushrod length (geometry) with shorter pushrods I measured for. Finished-up today with adjustments (a couple needed the pushrod guides moved too,) and worked several other things like distributor and coil install (Pertronix Flamethrower Ignitor 3 set). Have a whole lot more to go, but its looking good. What Ya'all think of the modified air cleaner I'm using now?