Hello, Just want your opinions. I have a 71 340 with J-heads, that has about 5000 or 6000 miles, since rebuild, on it. It has ran good all season long, but I want little more ummpph! would be nice. I have ran into a friend of a friend, who may want to sell their Eddie Alum. heads that have never been used at a really good price. So good I almost can't pass up. Do you guys think it would be worth it to make a swap this winter in the off season to get a little more HP. My 340 has TRW forged pistons, that if my J-heads have around 68cc-71cc comb.chamb. I am looking at about 9:3:1 or 9:4:1 comp. ratio. with the eddie heads I would be at 10 or more comp.ratio, plus the other advantages. In saying, I do believe in "if it isn't broke" theory and I drove my current set on 100 mile trips when ever I can. If I was to buy these and sell my J-heads, then this conversion would cost me around 600.00 for alumin. heads. What do you think? Thanks