[Sile360]

Hi I am not a pontiac expert Mrpbody should be along soon and he's the guy with all the answers, but I know how it sux waiting so I will try and help if I'm wrong Pbody will correct me and I will have learned something :P.
Yes you can put a new carb on it now, IMO edelbrocks are always good to have as a starter carb and for when your doing engine builds, I find there a nice carb to throw on and engine to fire it up get the kinks worked out before you throw on an expensive high performance carb.
To me it seems your going in generally the right direction as far as the came goes what heads are you running, and what cam are you planning on using?
IMO a new cam and head work go hand in hand new rockers ect.

Don't forget about a new Torque converter as well.
If you have the money a good thing to do would be call around to you local automotive machine shops talk with the guys and find the one that is the most Pontiac savvy make sure it's Pontiac knowledge and not sbc. talk to him and have him help you map out a build to your taste.