14" Rally Rim Questions?

Ok, here's is what I've ended up with. 4 (14x5.5) rally rims. 3 out of 4 turned out very good. 3 (14x6) rally rims. 2 out of 3 are very good. My thoughts are:
1. The (2)6" on the rear with 225/70/14's and (2)5.5" on the front with 215/70/14's?
2. Or should I just go with 215/70/14's all around?
3. My homework says 215 is the biggest I can go on 5.5. Can I go any bigger safely with the 5.5" rim?
4. Handling wise, are there better combos I should be looking at?
My car is a '75 318 Scamp Brougham with 2.45 gears out back. Hopefully a nice cruiser.

Rally's done (2).JPG