Zrod,
A lot of the guys change the fenders, grill and hood (as per rulebook) on the '34 Fords to the '37 Chevy to get a little more air flow to help cool the engine.
What has likely happened, is that the right front fender was damaged and the previous owner didn't have a spare '37 fender to replace it with.
I would order a '37 Chevy fender bracket to be on the safe side. Nothing more frustrating than having to halt your progress to wait on parts.
In theory, everything should line up with little problem. What I have been hearing, a lot, is the new Chinese fiberglass is very thin and warps. Apparently, not a lot of quality control. I've heard of some who have had to use a little heat to get the fenders to fit properly. If you take your time and do some test fitting before drilling holes, you should be able to get it all to fit together.
Steve