if hes running a 350/2, chances are its not making anypower over about 9k. they definitely fall flat on thier faces by 9500. if its got good comp and a leakdown shows not much, then go with gearing. i crap out on the straight too. im pretty much tached out at the end. just past start finish. a good drive out of the chicane is really important. i also think i have a tranny issue that keeps me out of top gear at times. but that could just be me.
if youve never opened it i can tall you what to buy before hand. chain tensioner from chris m. its a slipper. it takes a little work to get it in but it might be worth it. run his iggy too. i have the barnett clutch with heavy duty springs. ask anyone and they'll tell you one thing my bike does do nicely is hook up. i can get wheelies out of the chicane if i really dump it. (either that or i spin the rear and crash) grab some pistons and valves etc too. if youre going to open it, might as well do it all.
hope that helps