Did you do the Power Booster/Dual Master mod with that Scott?
See my recent thread regarding the cross-member issue (at least for the chassis mounted booster - if I were to do it again, would go with firewall mount)

I installed the 6 bolt kit - for wheels I used OEM Steel Wheels of a 70's Model K10 which fit the bolt pattern but are wider and have better rear offset to clear the calipers
Mine was mounted with the calipers on the rearward side; it's been a while but I don't recall having any confusion over that during installation.
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'51 Chevy 3100 Truck - OEM 216 Engine; three speed column shift transmission
6 Bolt disc conversion with dual master/vacuum booster
12V alternator conversion.
235 engine in waiting grin