Fast ETs Using a Dual plane ( BB & SB )

I went from an old Edelbrock Torquer running 6.36 on the eigth, to a duel plane Edelbrock air gap and ran 7.4 with no tuning. Took it off and fitted a Mopar M1 with no tuning and straight to 6.41. After all the good words about the air gap I can't say how disappointed I was.