1972 dart 318 want to make the tires spin

Would changing the gear ratio be OK with you?
I'd suggest a set of 3.23/3.21 (8-3/4-8-1-4 respectively.)
Which also requires a shorter driveshaft. I had mine shortened for $60.

What cam do you have in there now?
If it has a duration a bit long for the gears, an easy way to gain torque would be a set of Rhodes lifters.