[earl87gta]

My 72 has good rockers and rocker boxes and when you take the top off thier is a noticable change in the door gaps. I would definitly have a top on while alining the doors the rocker boxes work to keep the blazer from flexing alot but the tub does flex not to mention that blazer has whent threw a lot as far as restoring ti goes so you may have a little bitt of body aslighnment problems to work out so you may need mount the top and front clip to get the doors lighned up I would hate to see you put the top on later and have to redo the doors and fenders to get the gaps write. for shims you can use stainless washers and just cut a slot in them they work grate that way and you can hide them by grinding them down to shape them so they cant be seen.