Lower cost transmission options?

Well if I can find an old A-999 for the right price I figure I might as well. FYI Chris Andrews also recommended the lower gear set, saying it helped compensate for the high (3.23?) gears in his own road-racing '73 Duster 340 he put together for the Leadfoot Rally in Pueblo last year. I know he has a few pics of it on FABO, I just have to do a little searching...