"...Anybody have issues with oil filter fitment on a pontiac 350 with long tube headers? Right now there is the stock housing..."
There is a filter housing that angles in towards the block. And there are small oil filters that will provide more clearance. I think the most common small filter, that will work with a Pontiac, is one that fits an LS engine.
A common number is a NAPA 1042 & Wix 51042. They're only 3.4" long, and less than 3" in diameter. Of course you can pick up the NAPA at your local NAPA store. The Wix filters are sold in lots of places.