Help me hook this thing up... I have the Chevy guys gunnin' for me...

Thank you :)
Your Duster is awesome ProSport!
Thanks.
Sadly, due to my blown budget and a growing number of (customer) projects piling up at our shop I'm going to do this in stages.
I want to be on the road this spring so this is where I'm at...
Thinking for now, in the back, I'll put the 3.55 posi in, squeeze in a 245 tire (255 if I can), get my big bolt axles and drums / brakes figured out, use the stock springs and I'll get or make some traction bars. I'll get some adjustable shocks now too. I'll get back to it next winter... or the year after that when I retire! :)
I'd like to tub it but imho I don't think it's the right thing to do to a car this 'untouched'.
Appreciate the input, thanks again!

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First off Magster65, your Dart is beautiful!
You've received some good info here. The main thing with a stock Dart is tire fitment.
I think you're gonna be limited to a 255 tire without moving springs and possible mini tubbing. Getting a 275/60/15 in there should be your goal. At the track I run a 275/60 M/T Pro Drag Radial in the mid 10's on 92 octane with 3.23 gears, but it's a 500" engine. The 275 works great. I use the old factory leaf springs that came on the car but I had one new leaf added to each side, cost only $50 each.

If you can move the springs in and run a Caltrac system you should have no problem hooking up with a good tire. A 3.55 gear would probably work fine, 3.73 at the most with a stroker I would think, and a short tire. I run a 3.23 in my car because even a 3.55 was kinda miserable on the highway but that's only my opinion/preference, everyone is different.

Good luck and feel free to ask questions!