Hi Bluesfan, I'd start by fixing any weights to the chassis near the motor mount but to the outside of the chassis. This is something that BJ4 owners do, despite the car coming in way over the limit, to counteract drivetrain torque to make the car run true on the straights.
After that I guess you could move weight around to see what works, need more rear traction add the weight to the rear, more turn in move some weight forward. If you don't need to change the balance of the car add the weight as near to the centreline and as low as possible to minimise it's effect.
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