i am using a 94 gsr head on a 92 ls block which manifold should i us?
gsr or ls?

 

itr or skunk2...gsr would be the one to use between the two you listed, but it is a pita. everything is soooo tight with that manifold.

 

You should stop posting multiple topics like this. Anyways, I would use a Type R. If you wanted after market, try JG Edelbrock. I really like the short, fat runners on that puppy. Never used one, but from the looks of it, I think it would provide good gains...