Fuel pressure reg/intake leaks

ok guys i need some advice. see my sig for setup. Currently i'm running 19lb injectors with stock fuel pressure. I also have a leak on the upper intake gasket (porting cover on ly held on by 2 screws).
The car is running like crap. took it to the track and could bearly muster low 13's at 105mph.
Question is how much hp would a regulator, with my mods, give me. Also what effect does the loose cover have on performance (i will fix this winter). Finally i am putting on underdrive pulleys will this add at all to performance?
Thanks for your input, i am spending the winter fine tuning because i know its all in the tuning.

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306ci, TFS stage 3 heads. port/pol edlebrock performer intake.
77mm mass air, 70mm TB, crane 2030 cam, Mac full length headers, flowmasters
3.73 gears and more.