Alright. Talked to a local shop - did not turn out well. Guy was going to hack up the Z.
Went to a different local shop on recommendation. 2.5" exhaust, high flow Magnaflow cat and Magnaflow muffler, couple manifold bolts tapped and replaced. SWEET new exhaust.
Thanks for the response, Greg. Hillsboro was a bit of a drive for me, and the place I went was a hot rod kind of place so it worked out well.
BUT! After that, I found a local DATSUN shop that I wish I would have went to. They did a bit of fiddling and tuning of the engine that was much needed. Wish they would have done my exhaust as well.
If anyone in Oregon needs work done on a Z, or any other Datsun, Bill's Datsun Shoppe in Clackamus off 212 is AWESOME!! Man, please local Portlanders, check those guys out. They know them's some Zeds!