The driveshaft for a Th200 4R is the same as for a Th 200C. All 7.5 automatic G bodies use the same shaft length, but the 8.5 G bodies use one that is an inch shorter.
The carb bracket is the same, but the carb's bell crank will not have the proper geometry for a GM TV cable transmission. Also, the stock bracket will not work right with a Edelbrock carb. You will need both a throttle cable bracket for this application and a TV cable geometry correction kit for the carb.
1985 Cutlass Supreme Brougham (ex pizza delivery beater with 240,000 miles):
355 Chevy- 9.5:1 compression, Comp XE 262 cam, World S/R Torquer heads with 2.02's, Edelbrock Performer, 800CFM Q jet, Camaro ram air system,Edelbrock headers, Comp Magnum roller tip rockers,TH 200 4R, 3.23 rear, aluminum hood, IROC steering box, poly bushings, Eibach springs, etc. Cutlass build thread here: viewtopic.php?t=4982
Also: The Thing That Won't Die-1998 Nissan Frontier, 340,000 miles of pizza delivery.