SDPC2000.com or gmpartsdirect.com I prefer SDPC2000.com for my purchases since GMPD screws you on shipping and handling charges.

You might check with Allen on what he can get you.

Springs will be needed according to the cam you get. LS6 springs are cheap through SDPC, like $60 a full set. SDPC also has a full dual spring set good for .650 lift made by MANLEY and they are $299 with titanium retainers and keepers included.