Boost and timing

Sounds like you have a pretty stout bottom end. I run a stock 318 mag, EQ roller heads, 62-1 turbo @ 13 lbs on E85. I have megasquirt II and I start pulling timing at about 4 lbs at a rate of 1.5 a lb. my total is 36 under load. On pump gas, I pulled 2 psi per lb. starting at 0