Reverse Servo should be swapped for a single bullet piece, the 2 piece stock design is known to fail easy with added pressure.

6 Direct clutches don't always make full engagement on the input shaft using the forward clutch plate. Had a few diesels chew the input up from them not engaging enough. You can also use the 48re plate instead of using the forward pressure plate as well with the thinner clutch's and steels.

Also everyone what I've ever done with power i replace the front drum spring retainer for a TCS one.

I like the aftermarket heavy duty front drum spring retainer also.
For the rear servo, I have used both the "billet" 1-piece units, with heavy duty (thicker) spring retainer;
and also the "billet" Sonnax type replacement piston and still used the factory inner part, but shimmed the spring solid.

Link to Sonnax web site
Part No. Application OE Part No. O.D.
22912C 47-48RE '97-Later 52118745 2.46"
22912B 47RE/RH '94–'96 4531229 2.46"
22912 46RE/RH, A727 2801281 2.80"

CRT has a kit with the heavy duty front spring retainer and new springs.
https://www.coperacingtrans.com/?product=727-front-drum-spring-retainer-with-springs-2

The heavy duty front band strut is also an inexpensive upgrade.
There are many sources and a couple styles available.

I first saw this tip from a B&M instruction set.
Improves fluid flow to the front clutch pack, for better lubrication and cooling in lower gears.

In the original poster's video, they mention shimming the front band servo solid (later style with large pin and only 1 spring).
This is a pic of one I did, you can see the dimensions of the shim needed (yellow arrow).

Wonder why a billet drum wasn’t included. Got to have some safety.

I've always been skeptical of that mod, lets more fluid in but nowhere for it to go unless the periphery of the drum is drilled.

Could always take that up a notch.....

Now we are talking

So what power level has that bit of swiss cheese handled?

Which bands?

What year was the split between the early and late model trans he is talking about in the beginning?

the three pin NSS started in '69. the single pin NSS was 66-68, not counting the pushbutton 62-65 transmissions, which also had the single pin NSS. i'm not sure that the pushbutton NSS was even the same as the 66-68 switch. maybe JK can clarify on that.

Actually, the 3-prong NSS was introduced late in '68 (5-15-68). '62-'64 PB switch on left, '64-'68 2nd from left.

JK, i knew you would know for sure !

Went low tens in a 3400lb car.... it was in a trans that I bought. It was also machined on the back side and quite light. I upgraded to a billet drum as every car that hits the track should have