New to big trucks with my 1968 peterbilt 359

Well after quite awhile watching Craigslist and marketplace I found a part out with lots of good parts to clean my truck up a bit. It still has a 5+4 in it and I can get the main box which I belive is a to-905c with ratios 6.11 3.31 1.82 1 and .84 although all my tags are missing I believe my aux to be a 8341g with 1.60 1.22 1 and .813 my axles I belive are 5.29. The aux and axles ratio guesses are based off of the speed I am able to reach in each range. My question is would these boxes pair well together? My main goals are to get the truck back to being more original and a higher top speed then 62, the new trans should get me 74 which is enough to be comfortable. Just don't want to wind up with a bad pairing and a bunch of unusable gears or overlaps.