Need A Recipe For A 273 Rebuild

I am in the process of setting up my .040 over 273 2bbl for class specific racing. I know up front that upgrading to a larger engine would be more cost efficient for bracket racing, however. It seems that the biggest hurdle is compression. The 2bbl engine is rated at 8.8:1 with the pistons .011 down. NHRA minimum combustion chamber size is 57.3cc. Mine were as large as 65cc. Head gaskets are another problem. The original steel shim are .020. They also had a small bore for the 273. They are no longer available. Sticking with a solid lifter cam requires a custom grind. Headers are available through Harold at Spitfire. I am waiting for mine. I used a Pertronix setup for ignition. I am optomistic about this build, but also realize that it won't be as fast or as streetable as it would with a stock 360.