some c20 vanette's came with a 4.1:1 ratio,
usually the passenger ones.the quick check seems to be alloy centre = 4.6:1,steel centre = 4.1:1,so cruise round some of the commercial wreckers,& you might find the right ratio.the problem with bluebird h190's are that they have large diameter axles,while the c20's have the same diameter as h165's.also,use the tailshaft from a h165 1200 ute,they are the correct length.where abouts are you r-fast,cause i know there are some c20's out at rushes pick & payless here in sydney.