Oooh...
Here's Tom shutting off his car at ChowdaQ 2009. I didn't bring my camera last year so didn't snap a repeat pic.
That'd be a cheap thing to fix before re-evaluating oil consumption. It'd also be worth running/parking over cardboard to determine if you've got some hard to spot leak thats causing some of the consumption.
If it were me I'd have the head redone. I think you're probably going to want that no matter what. The 115 617 engine is relatively rare since they were only 2 years, I don't know if you can use a later 617 block or not. That would be a relatively easy answer if you could but never the less a known good head would be a nice place to start no matter what.