I can't tell you which way to go, it is your decision.
But from my limited experience, you don't need the valve reliefs as deep as your's are spec'd.
FWIW:
My 440-1 setup is not the same as your B1-MC, but I was running a cam with 0.750" lift, 279/290 duration at 0.050", 112 LSA, installed intake CL 108.
My piston to valve clearance came out to 0.155"/0.231" (int/exh) with 0.014"/0.020" cold lash for checking purposes. Again, valve relief depths were 0.290"/0.265"

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