'302 heads on a 273?

Thanks Chief. Yeah, my 273 has a '67 factory 4 barrel intake. I thought I saw a chart somewhere that said that the '920' heads were 65cc chambers and '302's were 63cc's? Am I correct there? Do the '302's use the same cast-in rocker shaft supports as the '920's and at the same height,so I can use my adj.rockers and pushrods?

I'm also thinking this will get me hardened seats (for unlead gas), and the 'swirly' chambers.

Thanks guys. This is great stuff