Stock"ish" Front Suspension for Pro Touring/Autocross Oriented Ride

Hey A-Body Nation

My Nitto 555 tires came in the other day. I love these tires! I am getting ready to measure for wheels soon but want to run my intentions by you before ordering. The tires have been mocked up using the wheel simulator tool. Rears will work fine but the fronts are a little tricky. (May need to downgrade size due to interference with fender)

Fronts = 245/45-17 Nitto 555
Rears = 285/40-18 Nitto 555

I am working towards the Pro Touring look. (Reference the green G-Force Demon from Design Concepts for a close representation of what I want.)

My question is geared towards the auto cross crowd. With the Pro Touring stance the car sits much lower than stock ride height.

You guys who are running a stock style front suspension, what are you using for...

1. Torsion bars?
2. Springs?
3. Any other stock"ish" suspension upgrades to make it all work?

I'm running into the issue of the bump stop as well. How do you get around having the bump stop limit the motion of travel without killing the ride?

Additional car info:


1970 Plymouth Duster
Your help / guidance is appreciated!