disc brake distribution blocks & booster

I'm looking at ordering the 3 piece disc brake distribution blocks for 70 B body on ebay, #190820430101 from motor citymusclecar, just wondering if anyone has purchased these and if they are decent, I'm converting my 67 coronet wagon to discs, tried some used blocks but having some issues, for example almost can't lock up the tires even if I really get hard on the pedal, it might also be that I'm using the factory drum booster, so also looking at getting a 70 disc brake booster as well, ebay #201233594296 from pirate-jack-asheville-nc, any one have any dealings on the booster? Thanks

pirate jacks sent me uni junk and chevy crap also , call doctor diff ram man buys from doctor diff also . good luck .