5.3 head choice! Need help
#2
If your 706s are castech then I'd go with the 241s, but 799s can be had for almost as cheap and decked .030" for a nice improvement. If you're adding a cam later then the 243/799s will respond nicer.
#5
Running that cam is going to require a stall, tuning and maybe some gears depending on what you have now. With 706 heads I'd run the 212/218 or something close, but with the larger intake valve on the 241s or 799s I go with a larger split. Not to bash the thumpr, but it has a low LSA and high duration and I think you may be disappointed without a lot of complementary parts including a major tune.
#7
do you want power or sound ?the idle rpm and exhaust system will determine the idle sound.check out camquest6 at comp cams .maybe check out a Texas Speed cam pkg,cam,springs,push rods for $600.you can get a cam with a narrow LSA.
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