TIG one out of aluminum, then put bungs on it for your pressure fittings. You can probably get a radiator place to do it, and if you get the fittings put in you can have them pressure test it. Or mod something like this:
http://www.ecklers.com/corvette-expa...1968-1972.html
You may already have one of those- you still have your Vette, right?
Based on these pressures, sounds like an oil application
