I head there are NO RHD oil pumps left. Ie. start collecting cores and start mixing and matching parts to get one to work. No rebuild rotors either. This was on a slantsix.org post. I thought a standpipe was for the cartridge filters, not the anti-drainback spin-ons they went to so they just took it out of the build with a spin on with an anti drain-back valve. But Dan's article still showed them in the 80's