I used the speedway kit..9 inch dual diaphram booser, 7/8 master cylinder, auxilary vacuum pump set to 19 in. and a large home made vacuum tank hidden on frame rail. Brakes work just like my wifes newer car..Should have done it long ago...because of the calipers in the kit you need to use a dual bore master or you can do like i did, use standard master with 2 lb residual valve for front brakes