LS Engine install How To/Procedure?

[52MNResto]

Newbie to the restoration/engine swap, I have a lS1 5.7L. from a 2001 Trans AM with its matching 4L60E transmission. Its going into a 52 Chevy with original frame. I do not have the wheels, tires or bags yet. front suspension is in (Mustang II)

Now I have the ride height measured from a different truck (ground to bottom of frame front and rear). I am wondering if I need to get the wheels, tires and airbags installed before I put the motor and trans. in.

OR

Can I put the truck at my measured ride height mount the engine and transmission than get the bags, wheels, rims.

I have done research but have not really found a definite answer. So what have you guys all done?