Stock valves in iron heads question

Have a pair of 346's that were home ported years ago & have been on a buddy's shelf. The valve job is/was fresh. They still have the stock 2.08 valves though. I'm already going to have the seats & guides cut for dual springs as I'm running a small solid roller (.555). I really don't want to dump $500 into a set of heads that aren't even mine.

Is there anything wrong with using stock valves on my new 451 shortblock for a season or two? Trying to get the Dart going on a budget.