Charlie Chalk, 1275 a series... that'll be single cam yeah? If so then you can forget about what i said about dialling out overlap. This is only relevant on multi cam setups as the overlap on your single cam is determined by the cam grind.
Due to your resto thread i assumed you were looking into option for the yb lump going in the rst
Single cam dial in will still be relevant when looking at valve/piston clearnace though.....although i'm pretty sure you'll have no problems running the std NA cam when turbo'ing the a series.