Best bet would be the .027" c/t 4.160" bore cometic headgasket as I mentioned before,the thinner compressed thickness along with the smaller bore size (4.160" vs. 4.300" for a "std.") should yeild just a bit more squeeze,also will help the chamber dynamics some by moving the piston closer to the head for better "squish".
They are'nt "cheap",but nothing good rarely ever is.
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