yep, everything 06 said, but with the timing, its all dependent on what fuel you run, your elevation and compression. +4 seems to be pretty safe on 94 pump gas on 21/20 cc domes @ sea level.
porting is going to get you infront, so try work towards that, a dune ported, stock carbed, T5'd with increased compression and ignition advance (timing plate) will make around 60-65hp so hit a sponsor up for that. and while your crank is out, you should get it trued and welded.
i dont know what your budget is, but if you dont have enough, just keep saving till you do.
talk to a sponsor, they will point you in the right direction.