What would be better power wise and long term life wise. Rebuild my current 150K '87 302 with GT40 heads, headers, freer flow exhaust, or swap in a stock 351 either used, or one of those $2,000 new 351's. I have never driven a "built 302" so I don't know what I could expect. I have driven a 351 and it is better than the 302, but by no means a worldbeater. I would like to keep the price below $2500 if possible, but please give me your suggestions.