Have you tried the stock 6 cylinder bars in the car with the BB? If not I would
I ran them, stock 1971 6 cylinder bars, in my old pump gas 1971 Duster with ladders and coil overs weighing 3450 lbs. with me in it, they worked good enough to run a bunch of 10.00 at 134 MPH in the 1/4 mile on a set of 315x60x15 M/T ET Street Radials using a set of Koni SPA front shocks up front