Back to 30A rider, I dont know what machine work is in your area, but I had a set of 049 heads done last year...milled to 113 cc chambers, larger valves (2.19/1.88) , teflon seals, set up with the springs I supplied, all ready to bolt on...and he also supplied the valves, I told him to get what he usually uses...they cost me 675.00 complete, ready to bolt on and go. That's lots less than any aluminum heads, and they flow like crazy. Small intake runners so they're good for low end torque like you want (same as your 781's) If it's primarily a street car, I wouldnt be concerned about the weight savings, especially for that extra money. Also, the fact that you can run a higher CR with aluminum (true) does not apply here, cause you're only looking at under 10/1 anyway. So I would definitely go with the iron heads...just my opinion. Also, respectfully speaking, vertok's post, as Henry said, is nonsense.