Another ? about 273 heads on a 318

The 318 I have had 273 heads on it, the compression was about 9.0:1.
I'm getting ready to do exactly what you did....wondering if you used a thin head gasket to get your 9.1? I saw a gasket that's like .029 thickness instead of the usual fel-pro .039" ..... using a .450" cam or basically a 340 cam.... see what happens.....