too much timing , start over -----------
i ran a 870 on a hot 406 sbc in a 92 gmc shortbed , got 16.1 if I kept my foot out of it , of course it ran faster w/ an 800 double pumper on it .
This is in a fly weight race car with a 5200 stall converter. I used to run locked out ignition so I'm being kind at 24 deg. No reason in this universe a car will run faster with a DP