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Cartek Racing has done some fine porting jobs on the FAST (and stock) intake manifolds.
The same proven workmanship/skill that has made their many years of cylinder head porting so successful has also been applied to their intake and throttle body work. www.cartek.net
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
Part of a complete porting job is to match the ports on the manifold to the ports in the heads. If you are having ported heads installed, the installer should be able either to match the ports himself, or arrange for it to be done. Talk to the installer of your heads.
If you are running stock LS2 heads, then the cleanup and mods by SpinMonster will give you a package you can install yourself, and will not be exceeded by anyone else NOT having access to your heads.