When you block the car, you need to make sure when you put the torsion stops on the torsion bars that the torsion stop screws(Bolts) are far enough through the torsion stops so you can add/subtract turns if needed. I generally run with about 1/8-1/4" of thread out the bottom of the stop(Going from memory as car is in bits), you may need to move the torsion stops one spline on the torsion bars to get them to go back on with the extra thread sticking out the bottom.

I generally don't worry too much with ride heights(On dirt anyway). Basically just start with whatever size blocks the manufacturer recommends. With a heavier driver I'd set the rear blocks 1/8-1/4" shorter than recommended(if it says 3" then run 2 3/4"), this will help keep the rear at the intended height with the heavier driver or else run one step heavier torsion bars in the rear(instead of 0.800" run 0.825")

Adjusting for corner weights,cross weight etc will screw the ride heights unless you start add or taking out turns on the opposite corner etc. As above get the Steve Smith book it should be helpful, I know the Midget one is.

Otherwise I know it's a different chassis but check out Hyperracing.com, the Hyper chassis website has a wealth of setup/preparation advice & instructions which I'm sure if you spend some time reading will hopefully answer some of your questions & help sterr you in the right direction.