Re: Wheel sizing Help
You can search and read countless threads about wheel/tire sizes, and there's a "sticky" posted at the top of this page and in the Suspension forum that show pics of combinations of 1st gens that'll give you a good idea with specific year, wheel/tire combo, and suspension changes.
Having said that, 17" all around are a great and popular choice among members here. You should be safe using 17x8, 4.75 bs for front, and 17x9.5, 5.5" bs for the rear...in conjunction with the TVS system you mentioned. You can go anywhere from 215 to 245 on front...and up to 275 on the rear..no sweat. But beware that this is general info, and that each same year 1st gen can truly be different.
And welcome to TC!
Learning & Relearning about the cars I grew up with.
69' - Built 350, 750 Holley, Elgin E920P Cam, 283 PP Heads, Long Comp Headers, MSD, TKO-600, 12 Bolt Posi 3.73, Hotchkis Rear, Eibach Front w/Hotchkis Sway, SPC UCAs, 3rd Gen PS, AR TTII's. Still working on it.