what solid cam is equivalent to a hyd 268 ?

They never came with .020 gaskets. They were replacements. I had/have too many 273’s, unmolested. Factory 273 2 barrel pistons are usually within .020 below the deck. My 64 was at .010 below deck. You never know what someone else did to an engine unless you measure everything. Been around Racing too long not to know that.