How would this tire combo look?

[PHJ426]

Car is a 1972 Road Runner putting 14" brakes front and 13" brakes rear.

Moving the rear leafs in 1 1/4" per side.

I started my tire selection based on tire diameter and width second
Front diameter 27" width 9 to 10"
Rear diameter 28" width 11 to 12"

So in BF Goodrich KDW I found the following:

255/45ZR18 for the front that is a perfect fit at 10" wide and 27" tall
or
255/40ZR19 10.2" wide 27.1" tall

The rear tire is where the problems come in.

Closest match I can find is either:

275/35ZR20 10.9" wide 27.6 " tall

or this would look like a truck tire unless it was tucked into the well good:
295/40ZR20 12" wide 29.5" tall


Based on the above options I would guess the best look would be from the
255/40ZR19's front and the 275/35ZR20's out back

Could a 295/40ZR20 at 12" wide and 29.5" tall ever fit into this kind of car and made to look like it should and not atruck with leaf springs in the rear and not tubbed with a 4 link ?

Thanks in advance for the help I need to figure out the tires first then I can pick a rear end width and gear ratio.