I assume he is re-visiting since going up 2 steps in cam size. Since the 1st set of heads may be the small 302's then it will have a hard time revving very high and I would think that the 901 single springs with damper would be more than adequate.
Not 100% on that....but you have the 9091 spring, right? If you go to viton seals, then there are a few different sizes, but IIRC, you'll have no choice but to cut the guides down in diameter.
