416 build what cam ?

ok guys school me a little bit and excuse the rambling this was my old combo 340 .30 11.5-1 pop ups [mopar/forged] j heads mild port work 208in-160ex air gap 700dbl pump holley mopar purple solid 528-248/248 [old school] 1 5/8s headers 3'' ex 8/9''turbo action conv 4.10 gears 28'' slicks i ran a best of 7.7@88mph 1.7 60ft [i know].How much or mobetter will a 416 be i want to try for 6.9-7.0.this is in the 8th and the track sucks only 1 lane that is all concr other side all assfalt help me understand