Digital ignition curve input

My tires are 28" 255/60-15 SS Drag Radials... You may be right about 3.55s being jumpy in which case I will go with 3.91s
With a digital curve I can drop the advance just off idle and bring it back in around 1600 rpms.
3.55s will net me 7.94 mph @ 900 rpms

I was told MAP sensors arent real accurate at measuring Vacuum and that I should just tune my pod on the distributor.