I'd super tune it first. Timing, total advance, good TQ carb set up just right. Should have "J" heads on it already, should have a premium forged crank, but maybe not. Should have the good 340 cam and springs. You can not run 68 to 71 pistons on pump gas with the stock cam anyway. If you get it tuned perfectly, maybe some gears. 3.55 or 3.91 with a sure-grip. Enjoy! If that is not enough for you then as Moper says...