There are lots of dual master's out there that'll work just fine on your truck.

The deal with the dual master is four things:

First, with no booster you'll need a smaller bore master.

Second, the mount- You can buy one from any number of vendors for about $100. Or you could make one if you've got a welder and can have the hole for the master drilled- Basically, a piece of steel with a hole in it and two bolt holes. Then another pieced welded at a right hand angle with two holes to mount with.

Third- You'll need the valve -residual valves front and back, proportioning valve or a combination valve and the residual valves- Check out the speedway catelog to get some ideas.

Fourth- the master cylinder itself- Pay someone to pick it for you or using the master parts catelogs at NAPA figure out which one will work for you- Shouldn't be hard, I'd start with late sixties/early seventies sedans.

EXTRA POINT- Do a search (using the button in the top right of the first forum page) on master cylinders and read every post before you do anything else- There is no substitute for good research, and this is a topic that has been covered before

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi