1936 Coupe Tranny options ??

[Al 29Tudor]

Good morning Gents,
I intended to post this question here yesterday but apparently posted it on the model "A" forum.
I've been on the model A forum for several years but I'm now considering buying a 36 coupe. Are there any transmissions you would recommend for highway use. I'd like to cruse at 70 mph without killing the engine.
Is the F-150 four speed an overdrive tranny? If so, is it close to the 25% reduction of the Mitchell?
Thank you for your help.
Al Leach