called steward for pushrods. $10ea for 5/16 .120 wall. says they will work fine with flat tappet@.650" lift. no 11/32 available. Manton wants $16ea. from what I see on the price list.
Smith Brothers does 11/32.
I'm of the mind you can never get a stiff enough pushrod.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston