I'm in somewhat of the same boat with an 85 Monte Carlo Super Sport. Right now (for 2011) is the 130 Club. Since the car hasn't been run since I built the motor several years ago (computer sez it otta make 550 hp...I'll figger 450-500 out of a roller-cam, AFR-head 406) it'll be a challenge just to get into that Club without something going wrong. 2012 (assuming that it makes 130) will be an attempt on the 150 Club.
Both of these are USFRA only and run at WoS in September...unless I could sneak it into BUB's "Run Whatcha Brung" class...but I spose they'd notice right away that it had too many wheels.
I don't plan to change any glass in the Monte. It's a "frameless" window (2-dr hardtop) type (close to the longest and heaviest doors GM ever made) and as you said, Johnny, working inside the door panels is a real bitch. I've changed enough electric window motors (mine doesn't have 'em, thank Providence) and other parts in 'em to have scars on both arms from the sheet metal. I wouldn't wanna swap glass/Lexan back and forth. Besides...I've got too much other stuff to do before September. I guess I otta go out to the garage and swing a wrench or two.
Hope to see ya on the salt.