66 Dart master cylinder replacement
http://www.earlycuda.org/tech/dualmaster.htm
I ran across this site last night. I think my new plan of attack is going to be to run a coupler to extend the rear brake line directly to the MC and use a rear axle brake line "T" from the MC to the L and R front brakes. Upon further review it looks like using the year one block will be more problems than its worth since I want to use the brake lines that are already on the car. If you're going to run new lines it shouldnt be an issue however.
Good luck on yours, ill keep you posted on my progress this weekend.