New to me 85 Sub "Project Clusterfunk"

[6 Door King]

I found myself a 350 powered rig to replace my required 4x4 vehicle after selling my Jeep. I was fortunate enough to find one with a GM rebuilt 350, recently rebuilt trans and a terrible camo paint job for 600 bucks. Drove it home and discovered the radiator had a pin hole, the air shocks don't hold air, the front springs are beyond flat and have three inch blocks in place to compensate, and the carb is missing the choke and vacuum pot. Not complaining, I knew most of this, and for the price it is worth the trouble. Was an old volunteer fire truck, so it was red at one point, and is laced with tons of now useless wiring. I have decided to chop the rear off the top and close it in using the roll down window from the tailgate and possibly bob the rear end after working out how to replace or move the gas tank. Also considering using a Blazer top to enclose the new rear section. Does anybody know the dimensions for the top from a 73-91 Blazer/Jimmy?