Leaf springs?

Hey fellow Mopar maniacs,

My brother and I Just bought a 1971 Dodge Dart (he's on his way to get it 11 hours away) that we're going to make a street/strip car with. We have a complete bone stock 1978 440 with the 727 transmission and the car came with a big block 400 that's in pieces and needs to be rebuilt. It also comes with a forged aftermarket stroker crankshaft that is supposed to make the 400 into a 472ci. I need to find out more information about the stroker crankshaft and which other components I need to use to make it work correctly. So basically, the car will be getting either a completely rebuilt 440 (built mildly) or the 472ci stroker big block completely rebuilt.

Originally the car came with a 318, I'm not sure what the stock rear end was but now it has the 8 3/4. We know that it's a posi but we're not sure what the gear ratio is yet. We're hoping that its between a 3.55 and a 3.91.

To get to my question, I'm wondering if we should change the leaf springs? We are planning on getting a spring relocation kit and installing larger wheel tubs so we're able to hopefully put a 10" tire under it. It will be roughly a 75% street and 25% strip car that will hopefully run mid to high 11s. Which springs would you recommend? And why?

Thanks in advance for any information, suggestions for recommendations!

1971-36.jpg

1971-14.jpg

1971-20.jpg

1971-30.jpg