60's truck with 70's front crossmember questions??

[defgone]

i have a 63 longbed c20....will continue to update build as progress happens...i picked up a 75 and later front end from a c10 suburban...i ordered drop spindles and bags for front....questions:

-does any one have this set up with pics?
-if not how low do you pro's think the truck will get aired out?
-if i want the cross member to lay on ground will the lowers need to be cupped?

thanks for the help