Prepping an "early" (~1966) 727 for truck use

Ceedawg said

Use it as it is, was set up good from the factory. Those years hit hard on each gear change. I’ll add, each trans is set up with clutches and springs for the engine it’s hooked to. 383-361 trans will be different than a 440 trans in that aspect. The small block trans is either 318-340 or 360, and also have different pieces. Get a service manual, it will show what to use.

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See I was told it was behind a RB but you couldn't get a 440 in a '66 Charger. I do have a 1970 Plymouth service manual I'll take a look at the specs it gives. Thanks to YouTube teardown videos these transmissions actually look like something I can handle pulling apart, at least partially. I won't go near a 48RE though hahaha

The part in the video I'm referring to specifically is actually at 6:15, "early and late model front direct drum bushing"

Regardless of what valve body I run I'm gonna put a TF-2 shift kit in it. I have some experience with that stuff as last summer the valve body casting in my '70 Duster's 904 cracked and I ended up swapping to a later-model VB with some at-home mods I learned from the folks around here actually (removing check balls and drilling out separator plate holes). The VB in my 1972 truck trans as well as the 904 in my Duster have part-throttle kickdown which is really nice as the part-throttle upshifts are super early like all Torqueflites... that's really annoying btw any way to bump up the light-throttle 1-2 shift RPM?