Stock 318 2 Barrel Cam Choice

I'd run the single 901 and not look back. My God, it's barely over .450 lift and won't be by the time you add lash.
when I was at my local hot rod shop, there was a brand new offy slant 6 valve cover.
I will need to look again, but I think they might have the lifters you need as well. If you really need them I could buy them for you and ship em. @RustyRatRod
Forsyth Hot Rod Supply