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Mitchell has the least amount of work to do to to install, involves next to no cutting of original vehicle, but.... you still will not have a synchro on first and a slow synchro on 2nd, plus the stock trans is a bit fragile.
T5 and F150 both have a lot of work to install, and involve a fair amount of modification of your crossmember etc. Both can be made to work with a torque tube if you dont want open drive.... the advantages of course are full and fast synchros and pretty much bulletproof behind a flathead. T5 obviously has the advantage of the extra gear, but the disadvantage of the shifter being further back, even with the S10 model. F150 has the advantage of the shifter being only about 2" back from stock, and is a bit easier to convert to torque tube.
Your call....
Or.... you could just change the rear end gears out to 3.78 or 3.54.