dodge slant 6 parts source?

Im working on a 1965 Dodge Dart with the slant 6 engine.  Where is a good parts source for pistons/rings?  It's been smoking, burning oil -it appears to be poor sealing on the piston rings.  Compression is about 120 psi on all cylinders.

Maybe you can contact your local machine shop, engine rebuilder or speed shop. They may have a trusted source or recommendation for you.