318 time improvement

Well last time I went to the track my car did a 14.88 @91 mph with a 2.01 and the build was...
40 over edel performer, edel 600 cfm, hooked headers, 3.91 s.g, stock heads and bottom end, 904 manual v.b.. Herbert cam 477 lift 225-230 @50

so what I'm wondering is how much improvement in times will I get adding the following....

302 heads 188-160 fully ported, edel single plane torker, 650 holley dp with a proform main body and a comp.xe 268h and heads gasket matched to int..

I have 28/9/15 slicks I'm sure the build now should have a 14.50-60 I just have to mess with tire pressure and take offs it wss my first time to a track so lots more to learn....

Anyway with adding the new heads, int, cam and carb what times do you think ill get