Spring Relocation and tire size

I suspect this has been asked before but I am looking to install the spring relocation kit from USCT (Mopar A-Body 67-75 Spring Hanger Re-Location Kit) for my 66 Barracuda... I will be swapping to a 8 3/4 rear end and wondered after these changes what size tire could I fit... would prefer a larger Rim 16-17inch if possible with a wide stance but dont want to have to do any other modifications... Any help on rim, back spacing and tire specs would be great.

Also before you buy an expensive rim for this are there cheap steal wheels available to try out?