Oil filter clearance problem on '74 360 duster

Hi all,

I think my car is missing an oil filter adapter of some sort. I have a '74 360 duster, and today I put a set of early 340 exhaust manifolds on it that I had lying around. One problem became immediately obvious: there was going to be no clearance to run a pipe down from the passenger manifold. So, I ran to napa and they came up with a filter that BARELY allowed the muffler shop doing the pipe to squeak a 2 1/4" pipe past the filter. This is a purely temporary situation-I won't be able to get the filter off without dropping the down pipe on that side, it's that close. I think there must be some sort of adapter to relocate the filter that I'm missing. Is this the 90* adapter I keep reading about?

If so, what's a good source to get one? Perhaps I should just put a remote filter setup on it and be done with it...