273 Build

Mike,
It was a previously rebuilt 2 barrel in '87 and that's when the '68 heads were put on. I added the 4 barrel I.M. and carb after that. Thanks for the closed chamber head information. I don't know what I will replace or how it will be rebuilt yet. I'm looking for an economical way to get it done. I don't want compression that will be too high for today's 91 octane unleaded gas. I don't have an engine builder in mind yet either; I'm looking around Ventura, California.
Thanks, Richard