Tech's comment about pre-loading an open diff car's rear axle - and sometimes the left front - is an excellent point.

As a small fwiw, both my roadsters have the battery mounted low in the frame, right side in front of the rear axle.
May as well put the weight where it will do some good.

Back in the day, little brother and I ran a C/Gas car - 50 Ford coupe w/built Olds Rocket motor.

Traction aids were:
Recap slicks, hard ones, this was just a couple years before wrinkle-wall slicks came out.
Open 4.27 diff.
Traction Masters - home-made, they look like the bottom half of a four bar setup: they control wheel hop and aren't much in the chassis tuning dept.
A couple of aluminum spacer blocks in the left front coil to put some weight there.
Air Lifts - an air bag inside a weak coil spring that goes between frame and rear axle. Air Lifts were designed as a load carrying assist device, but it wasn't long until the drag racers figured out what they were really good for.

We 'tuned' the chassis by doing short burnouts at the back corner of the dragstrip and taking note of the tire marks.
Black all the way across indicated proper tire inflation - dark in the center = too much air, dark on the outside edges = not enough air.
Comparing the black tire marks from one side to the other, if one was darker than the other, that indicated too much weight on that tire and conversely, not enough weight on the other.
Adding or subtracting air pressure from the Air Lifts would even out the marks.

Results with the early daze chassis tuning stuff meant that we could launch against a posi equipped car that didn't have a particularly well tuned chassis and hold our own.

It didn't take the other guys long to learn though and once they went the air lift weight jacking bit things got tough.
When they bought wrinkle wall slicks and we were still running our old-style hard recap slicks things were pretty much all over for us.

You may want to keep in mind how little wet weather traction there is with slicks - or cheater slicks - run on the street.
As well as many of today's soft, wide, fat radials work quite well in street use when installed in powerful lightweight coupe/roadster type cars....