That's what I was thinking too. The cam towers are not replaceable like the TFS 2v heads. Even if you were to try and get it welded, there's no way of machining it to the proper size without overboring all the rest of them. If there was a way to overbore them and then put bushings and then line hone, that would be a solution, but the cost involved is way too prohibitive to be worthwhile. You'd be better off going to a scrap yard and pulling a good low mileage head. F150 or any other 3V 4.6L application should interchange properly iirc.
2010 Camaro 2SS LS3/Brembo Victory Red/Black
SCT X4 base tune, Speed Engineering 1 7/8" LT's, CAI intake, Outlaw a/b
12.65 @ 115 as of 9/19/15
2009 GT Premium 5A BSM Rip 4/3/15
12.9 @ 106 best before loss