Help with brake line routing

[dylade69]

Been reading on here which line goes where from the proportioning valve and I"m alittle confused where mine run to,large opening on rear of prop valve to rear brakes and small line at bottom to front brakes?My prop valve looks a little different than other pics.(this is a 72 chev 1/2t, disc on frt and drum at back),I"m thinking i have a later model valve?any ideas,thanks,i hope the picture comes up as i"m new to this site