On my B1 heads, with T&D paired (5/8 shaft) rockers, I had to enlarge the pushrod holes away from the valves. Scott Koffel told me ahead of time this is needed, but not with the long single shaft rocker system.

Pushrod_holes_top-post1.jpg
1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1