'60 Apache Front Disc Brake Conversion MC to Prop Valve Lines

[Too Slow '90]

I installed a 1990 1500 booster for the conversion and purchased the matching master cylinder. I couldn't find a proportioning valve local so I ordered one supposedly specific to the master. The front line out of the master is 1/4" with a 9/16-18 thread. The front line in the proportioning valve is 3/16" with a smaller thread.

I was considering returning everything and ordering a combo kit from Summit etc... but the tech rep said he couldn't guarantee that their combo would work with the booster. He suggested I install an adapter in the larger port to fit a 3/16" line.

Has anyone run into this issue? Has anyone installed a specific master, prop valve and line kit on this booster? Is installing the suggested adapter a viable solution?

I thought I would finish this today but it never works out that way. I appreciate whatever help you guys can lend.