Reducing scrub radius vs. track width

[Larry]

[Devil's voice]...Build longer A-arms and revised knuckles. You shall have both small scrub radius and widest track possible....[/Devil's voice]

I picked up a Trans Am tube frame, bare. I didn't get the body, so I'm thinking along the lines of a street-driven Modified style ride with at least 335s all around that I can take autocrossing, drag, track, etc. This may be going too far, but the new MT Sportsman's SR 29 x 18 tires have me wondering. Other than maximum legal width for the street, the sky's wide open. I obviously don't have to be concerned about body clearance either.

Okay, if there's no limitation on track width, what would you recommend for my project as far as spindle height, SAI, UCA/LCA lengths, etc?