Hey there mate, the only thing was with applying the gilmour drives was that i went the expensive way of it, i shopped around and i couldn't find any place that would sell the pully's individually! so off i went to the wreckers with a tape measure and found the model engines which had the similar pully off-set to the mighty 3k! lol! in the end i bought two sets of gilmour pully's, one set was to suit a holden 202 red motor, and the other set was to suit a g161 motor (holden gemini). also in those sets i bought both gilmour belts. both sets cost me just under $1000 including the two belts. So, off home i went and proceeded to apply! i used the holden 202 water pump pully for the 3k water pump, used the g161 altenator pully for the altenator (nippendenso), i had to lathe up a 2-3mm spacer to slide over the altenator shaft to get the pully off-set i was looking for.........another breath..........., had to also use loctite on the tread as i only had 60% of the origonal length, and finally the crank pully, i used the g161 crank pully, i had to machine the inside diametre hole of the pully about 1mm so it could sit flush on the standard 3k crank pully, also i had to tap 4 new threads on the standard 3k pully so i could bolt the gilmour pully to it, i drilled the 4 new holes 90 degrees to the origonal 3k pattern as the two pully patterns were different to each other, i had to use allen key headed bolts to join the two together, as there is no room for a normal bolt head!
hope this helps, just let me know if ive missed something, or your stuck in understanding,
and oops, almost forgot, i used the holden 202 belt, perfect length, and yes it does whistle its arse off,
cheers, phatke30!