Front brake question

[Frijolito1988]

Hey guys, quick question I need cleared up for my disc conversion.I have a 68 shortbed. I have front disc's off a 71 , and I have a disc/drum master cylinder and have everything in and bolted down. My question is. I connected the brake hose from the caliper ( 71 caliper ) to the old lines that where stock on my 68 c/10 that where feeding to my old front drums. I am using the same disp valve , do i have to change to a disc drum valve or will I have any problems using the stock valve from the drum/drum on the 68. All the brake lines are the same on the truck exept for the front brake hose coming from the caliper that is from the 71,

Any input from your past experience will help. thanks guys.