Street A bodies with springs moved into the rails
I think that's the chart that's WAY not right.
@crackedback can tell us if it is.
That chart is hideous. I can tell you right now it's not right, because it lists the 7.25" and 8 3/4" as being the same width. Not even close. Heck the 8 3/4" width isn't even right. The perch to perch measurement is about the only thing on that chart that is right (43" for A-bodies). Where the heck do these things come from? Who measured that crap? Blind carpenters? :realcrazy:
Um, if the car in question has had the springs relocated to the frame rails that should be the 3" relocation, so, the perches should need to be about 37" c-c. Now, the frame rails are wider than the springs so that's not perfect, the car MUST be measured before the perches are installed. But that's the ballpark. And bodystyle doesn't matter, all A-body frame rails are the same width.
The width at 54 1/4" needs to be more specific. If it's the flange to flange measurement it's a little wider than an A-body 8 3/4, if it's drum to drum (mounting surface to mounting surface) it's a few inches narrower. It's more than close enough to make something work, just depends on how much you want to play with the backspacing.
A-body 8 3/4 flange to flange : '66-'72= 52 5/8” (BBP 7.25/8.25 = 51.5”)
drum to drum: 66-'72= 57 1/8” (or 57 13/16” for BBP axles and brakes)
And if you're curious
A-body BBP 7.25/8.25 flange to flange= 51.5”
drum to drum 8.25/7.25 = 56 3/4”
