273 Push rods too long??

any help please.
I am rebuilding my 65 273 comando.
I have some 302 heads that were rebuilt,bought off the interweb.
thay looked great and i had them touched up to remove a small anmount of surface rust.
at a machine shop.
when we went to put it back togather the push rods were too long even when we adjusted the rockers all the way out.
I have custom head gaskets from comedic 18thou thick. I wantded to get the cr up.
any help on what to do with the too long of push rod. can i just buy shorter push rods????
Please.. and thanks in advance