Smitty, you mean someone to custom fit a shotgun stock for you? If so, try calling the Thunder Mountain Trap range in Ringwood and see if they can recommend someone if nobody here can. They've been around a long time. 973-962-6377
There is a gunsmith that shares a building with Meltzers, which is located in Garfield on Outwater Lane. I have heard nothing but good things about him. Try calling Meltzers they should have the number for you.
I would also look into Griffith and Howe in Bernardsville. Pricy but top notch!
Try contacting Stephen Cobb in Bedminster. He may have a try gun and would be able to fit you. He has access to many gunsmiths and should be able to put you in touch with someone who can do alterations.
1115 RT 202 & 206
BEDMINSTER, NJ 07921