which heads are on it now-the 071s---in my passed reference, the small cc peanut heads have out done the 781s-the factory flow on 781s is much more--i have run the same set up with closed chamber head and then tried the 781s and lost 2 tenths--in my opinion hog out the peanuts -high flow valves and correct spring set up
As Beth says consider the cost of rebuilding the 781's Vs a set of aftermarket Heads. One thing it's NOT feasible to change OEM Specs by Milling Heads over and beyond just smoothing the surface as you run into all shorts of incompatible problems. 781's require Domed Pistons to get the Static Compression up to a point where you can run a stout cam.
If you running OEM Flat Top pistons and on a budget you're probably better off with Closed Chambered 396 heads on a 454 to get the Static up to approx 9.1 and run something like a 270H-10 cam.
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This was my 70 1/2 Z28
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