4" dropped axle on my 32.

24" tall tires.

engine oil pan and Derale (tub style) trans pan are 6" off the ground and have never hit.
Lowest collector is 5 1/2" off the ground and it's never dragged when driving although the exhaust pipe on that side dragged on a trailer when transiting from ramp to trailer floor.

My 31 on 32 rails roadster project has a 25" tall front tire.
Same engine/trans setup.
The car looks plenty low, but will be very practical in use.

I ended up buying one of the aluminum "Racing" jacks.
It's fairly low and just barely gets under the 32's axle center.