67 Valiant tire and wheel fitment

I am intending to do the following to my 67 Valiant.

Front will be 15x4" Vision Wheels (Jegs).
Rear will be 15x8" Vision Wheels from Jegs. I think they have 4.5 and 5.5 BS available.

Here is the situation:

I have fender well headers with a 440 (they are an unknown older brand and seem to be more swept back than the Hookers) which is a good thing.

Rear end will be either a 59" wide Explorer or 68-70 B-body. I can narrow the 8.8 but would prefer not to.

The car will have 3" studs on both ends.

Can I clear the studs and get a 275 on the rear without narrowing the rear end?

Suggested tire size for about 2000 miles a year in the heat for the front? Taller the better from my end.

Thank you for your help.