I've built an AOD in the past, it can be made to be a good transmission IMHO.
I towed GCW of 11K to 13,500 in the past, it kept going.
Besides the 4R70W is an electronic version with essentially the same mechanical internals.
When I built mine, the planetary assembly was coming apart, so I bought a 4R70 from a 96/97 Thunderbird/Cougar. I used the 4R70 internals in the AOD, this got me a few benefits, The clutch drums could accept more clutch plates, with the use of a skinnier pressure plate, also the 4R70 uses a 50MM(2 in) wide OD band, versus the AOD is only 1.5" wide.
I'm not sure exactly what could be done to modify the shift points, mine had the heaviest governor valve for an AOD, heavier = earlier shifts in the RPM range. I never had a tach, but that 300 six probably revved out to over 4,000 RPM at times. I'd surmise that a custom modified governor valve could make it work within the constraints of a 4BT.