Time to order wheels and tires.

TrailBeast said
Those are nice too.
One thing I found was with a 4.5 backspace in the back, the tire is off center toward the inside about an inch.
On my car a 215/15 has about 1/2 inch or less to the leaf springs and 1.5 inches to the fender lip.
I'm going to get some exact measurements before long here, but it looks like I will try an 8 inch rim with about 3.5 to 3.75 backspace.
So far as I can tell an 18 with a 40 series tire fits the front ok with the stock 4.5 backspace because it keeps the tire well inside the fender.
Like I said though, I have to get out there and measure for sure. :D

With an 8.25” rear a 8” rim with 4.5” of backspace will be pretty close to centered. It will be a little closer to the springs, but you need more clearance to the quarters than you do to the springs.

Unless you have a non-A body width rear axle, you won’t be anywhere near centered with an 8” rim and anything less than 4.5” of backspace. If you’ve got a Dart with an A-body 8 3/4 and BBP axles you should end up with about 6” from the wheel mount to the springs, and about 5” from the wheel mount to the quarters. With an 18” rim and typical tire overhangs, that means you want close to 5” of backspace on an 8” rim with the springs in the stock location.

73AbodEE said
why are you getting into this?
you just can't leave it alone ? stop quoting me and I will leave you to your lonely internet life.
or better yet , the ignore feature works pretty well too , try it out....

Yeah, I’m gonna go with mrgtx on this one. Just telling someone to “measure” isn’t helpful. A tape measure by itself won’t give you accurate information, and I don’t see you telling anyone how to accurately measure their cars. Or how to then take those measurements and figure out the backspace and tire clearance. It’s true, none of that is all that hard to do. But you aren’t explaining how to do it, so you haven’t helped any.

So, I have to wonder myself why you keep posting when you’re not adding anything useful to the conversation. You obviously don’t seem to need the information that’s being covered, so, don’t read the thread. Pretty simple.