Web Cams 294 regrind, Need help with this. Options

[bdawgbp1]

I just got 2 used cams from a 5S and am going to send them to Web Cams to get the 294 regrind done. I am running a basic modified 5S-FE in my 94 GT (CAI with K&N, 4-1 race header, Nology Hotwires, Pulstar plugs, and am fixing to have full header-back exhaust done next week - 2.5" or maybe even 3" for future boost). I was wandering what do I need to do with my stock head for the 294 regrind? I have been reading in the forums and have seen stuff about the valve shims, clearance, etc. I originally had intentions to buy a new/rebuilt head but didn't know if there would still be some additional work that would need to be done to it for the 294 setup. Any help would be greatly appreciated as this is my first "tuner" that I have done - pretty much done this sort of thing with '70 to '80 something model V8s before but the Toyota is another whole different ballgame. Thanks!