Hello all, I'm in the final stages of creating a 72 GS350 Clone, but the stock engine seems like a toyota compared to my new Yukon. I want to keep it stock, but I need more punch. I already upgraded to the 4 brl carb. Short of a complete overhaul, what would help the most? Change the 2.56 rear (which was recently rebuilt), to a 3.08 (which I think was stock on the GS)? Headers? Duel exhaust? Any other options? What are the pro's and con's of these options? Is it worth the change for a marginal power increase? Help my get out of the sloooow lane, while maintaining a numbers matching classic. Thanks Joe