NEED TRACTION, 15x12 7BS???? 600hp+ need help!!!

[1BADLS1tuner]

Hey guys some of you may know i finished up my turbo motor in my 68 STEPSIDE and i am desparate for traction lol...

I am wanting to run as wide as possible wheel/tire combo without sticking outside the wheel wells like crazy lol... I dont care about cutting box and making tubs

Truck is running 76 5x5 pattern chevy front end and rear end (with custom trailing arms).... I think the axle is a bit wider than the 67-72, not sure tho...

This truck will see the track maybee twice a year....

Thinking of running:

15x12 wheel with 7" BS Offset +6.00mm on the rear.... MCKEY THOMPSON 31X16.50-15LT ET STREET OR 31X16.00R15LT SPORTSMAN

15x8 4.5" BS on the front with MCKEY THOMPSON 26X10.00R15LT SPORTSMAN






ANY ADVICE, SUGGESTIONS, PICTURES AND SPECS OF YOUR SETUP.... its all welcome!

Thanks!