68 Camaro - MC? -->Baer disc/drum rr

[cad]

I have a 1968 Camaro that is an original power brake, 4 wheel drum car.
I added Baer disc brakes up front a while ago and am looking to replace the master cylinder with a style that does not leak.
It is the cap gasket that leaks. I have replaced the cap and gasket, but it still leaks. Fortunately, it is not too bad, but I hate leaks.
I have seen several Camaros with screw-on-cap MCs but do not know what they are off of.
Is there a late model on-the-shelf part to use in its place with little modification that is "virtually" leak proof or resistant?
98-02 F body is one I have heard, but I do not have rear disc. I do have a rear adjustable prop valve installed, and the pressure is backed way off.
I want to retain the vacuum booster, and want to avoid re-engineering the brakes on my own as Dave Pozzi advises on his site.
With the original style master I have now, the brakes work good, but I think the master, or original prop valve, is also not working to its full potential.
The master was replaced in 1996 when I did the Baer brakes.
Here are some pics for reference.
http://www.doukas.us/images/guystuff/Recon1.JPG
http://www.doukas.us/images/guystuff/Recon6.JPG
http://img353.imageshack.us/img353/9...c06340a7ii.jpg

Thanks for any advice or parts leads.

ps...I did search through 10 full pages of posts back to March of this year.

[cad]

This master is similar to the style that would be cool to run.
https://www.pro-touring.com/forum/at...achmentid=5465