[ERA Chas]

Russell "Speed Bleeders" are a MAJOR improvement.
They come with sealant on their threads and the internal check valve allows them to remain open while vacuum bleeding.
Use a smear of antiseize on your bleeder nipple to hose connection and you'll have NO bubbles.
The Jags rears are 3/8-24's as are single-piston GM fronts (I believe). Wilwoods are 1/4-28.
Good advice about the master cyls on a car that has been stored so long.