You can use the dual master cyl off of a full size chevy car and it will bolt to the two hole that are across from each other and you put the other two bolts back in to holed everything inside together, that how i got a dual master cyl on my 63 c10 that had one cyl for all four brakes and you will needed a proportioning valve, the one I used was from a 76 caprice with front disk brakes.

super250six