235 70 15 rear early abody

I guess the question should be:
1. "Will 235/70 15's fit in my early A body"

OR

2. "Should I try 235/70 15's on my early A body?"

The answer to #1 is in most A bodys yes it should fit. But the answer to #2 is depends on a few factors.
What is the implied use going to be? 100% freeway or 100% drags or a mix.
What is the rear end gear ratio? 2.45:1 then NO it will be a dog off line. But 4.56:1 then yes.
A quick check. Say a 65 Dart came with A-78 13's (155/78 13) and you want to go to 235/70 15. At 65 MPH your RPM's in the following gears:
2.76:1 = 2640 vs 2130
2.94:1 = 2851 vs 2297
3.23:1 = 3110 vs 2500
3.55:1 = 3440 vs 2774
4.56:1 = 4422 vs 3563

So say you have 3.55:1 gears and you take your A-78 13 off and put this 235/70 15 on it would be ALMOST like replacing your rear gears to 2.94:1 with the A-78 13's.... Good for commuting, not good for drags or Stop-Light to Stop-Light....
But if it were me, I have an extra set of wheels mounted with some 275/50 15 Hoosier R7 drag radials for my track only days.... I have these for my LRT on extra LRT 8 inch rims.

YMMV ;)