Nobody can actually assist you in your quest until you TELL us what your GOALS are with your car.
As I said before, ANY FE 4 speed will work with your car.
This Close ratio or Wide ratio mush is all FULLY related to HOW you want to drive your car. Race the strip, road race, mountain climbing, mudding, off-roading, bracket racing, or just plain old Street driving.
ANY Transmission made for an FE, be it a 352 360 390 or 427 is PLENTY for you in your car PROVIDED you pick it to do the job you want the car to perform.
Nothing else will make a jib-jab into a bucket of crap UNTIL you know what you want your car to do.
Does that make a lick of sense to you?
It is stupid and a waste of money to put a $4,000 toploader in your car and you only ever drive it to parades and to the store and church. You are NOT going to break a close or wide ratio or a small input or a large input Toploader, NOR a run of the mill T-10 doing nothing more than driving your car to work and occasionally hot-rodding some ricer from one light to the next.
You people have to realize that these tranny's have been pushing 5 and 6000 lbs cars for 50 years with ALL types of trannies in them with LESS issues and breakage than today's Modern technologically advanced trannies have.
To put it even more bluntly, you guy's OVER THINK things when a fella asks an engine or trans or intake or head question anymore. Everyone automatically say's that you nheed This or That mega tranny or super intake and godzilla carb or these super headers, when 99% of the time the guy is simply going to drive to work...
Remember this also, the 406 was a simple 400 ish HP motor in 62, at the flywheel, and even today with a mostly stock 406 he's not pushing much past 400 to the wheels unless he's really really modified it.
So KIS guy's Keep it simple. Wait until he tells us WHAT he intends to do with the car before getting into the finer tuning of the tranny needs for him.