ive used extra stock coil isolators for front lift. thay are 3/4 (.75) for each extra one. can usually get them at pull a part when someone pulls a front axle. for the rear, pep boys sells shackles for lowering chevys. they can give you 3" of lift.
as for a SYE, have you looked into a hac n tap? theres a certain year corvette yoke that works.
also to add. if you do a SYE a cheap thing (for automatics) is to use a front drive shaft in the rear