Let the buyer beware

[jmcap]

Hi guys,

Just sharing the latest needed fix to our '65 C10 stepside. So many errors done to it by the former owner/s. One of the changes was a conversion to front disk brakes. It appears that all parts were obtained from a 1970's GM system: M.C., proportioning valve, spindles with calipers and rotors, rubber lines, etc.
The hard lines to the front and rear brakes are plumbed wrong. Although the M.C. front larger bowl is feeding the front port to the valve, the outport is plumbed to the rear brakes and visa versa.
Here in lies my question. Have not ripped down any lines yet. Correct me when I'm wrong. The front outport on bottom of the valve appears to be a 3/8 -24 fitting? Is that GM standard?
The rear outport ( out the back of the valve) , is larger. Is it a 7/16-24 fitting or a 9/16-18 fitting? When I know I'll get an adapter to accept new 3/16 line with 3/8-24 fittings. Hope I'm on the right track!

John