Chev Valves in A Ford

:confused: Has anyone ever put Chev valves in a smallblock ford. I have a mag that says it could be done, I was just looking for any heads up info. I have a set of 68 4V heads that Im in the middle of porting and I would like to add larger valves, the mag used 1.96 intake and 1.60 exhuast. Any help or info would help.