Help with my wheels 68 Dart

Cragar makes a 14x6 (08060), 14x7 (08070), and a 14x8 (08080). According to their web site the 14x6&7 have 3 3/8" "rear spacing" (not sure what that is) and -3mm offset. They show the 14x8 wheel with 4 1/4 "rear spacing" and a +6mm offset. The two 14x6 rims from my donor car measure 3.5" from the outside rim to the hub face, and 3 3/8" from the inside rim to the hub space, so that works out to a -3mm (approximately 1/8") offset just like their specs. I was just wondering if I could run a 14x7 on the rear with something like a 215/70/ and a 205/70 in the front. Looks like I can. I have a picture of Ulf's 65 Dart Charger convertible and it looks like this is what he is running, but I can tell for sure from the picture. It looks like his rear wheels have are a little more "deep dished" than the fronts, but that would be a larger negative offset and not the 6mm positive offset that Cragar shows for an 8" wheel. I will probably just take on of my 08060's and try it with a 205 /70 in the front and a 215/70 in the rear and see if it all clears.

Thanks for your response.