I'm on board with putting the TH400/switch pitch so "I can finish this car the way it "should have been done" back in the 80s when I started it."
And, I can appreciate what you are doing because........... I am doing my resto-mod on my '68 Lemans to mirror what I recall in the mid to late 1970's. Jacked up in the rear, big & littles, 12" wide tires hanging out the rear wheel wells, ladder bars, one piece tilt fiberglass nose with no hood, outside tach mounted in a chrome pod attached to the vented panel right in front of the driver. Just bought a Kraco
bolt-on under the dash 8-track for looks, period correct Jensen
speakers to mount in my doors (yep, going to cut holes in the new PUI white door panels), Grant
steering wheel to fit onto my aftermarket tilt steering column.
I have the aluminum slots, but am not going to use them because the rears are only 8" wide where I need 10". So have another style I am wanting to use. I like the black 5-spoke American Racing wheels, but a little pricey - maybe at some point I will splurge.
Adding a vinyl top, 2-piece rear deck spoiler fabricated by cutting a Trans-Am rear spoiler in half, and plan on fashioning rear window louvers. Have a graphics package in mind as well.
I want a tunnel ram, and it looks like I am going to try my hand at fabricating one. I have an old Big Block chevy Edelbrock UR2 tunnel ran top that mounts 2 Dominators slightly sideways (I like that look of the carbs mounted a little canted for that "cool" factor). I plan on adapters to use 2 matching Q-Jets I have to keep it Pontiac, then form my tunnel ram tubes to the flat plate that bolts to the heads. The Wenzler tunnel ram looks too much like a Pro-stock tunnel ram of the 1980's - I want the Weiand look. Of course got my Doug's headers and plan on Zoomie style pipes coming out from under the car in front of the rear tires - I'll have exhaust cut-outs that'll direct the spent gases out those pipes, nice and loud.
So I have a look in mind and like you, I am no longer a broke teenager - or just flat out broke.
My problem is too many projects and not enough time.
Believe it or not, being that broke kid, I used an AC Condensor I pulled from some car I had and mounted it in front of the radiator - just like factory. Then hooked my transmission lines to it. Lot's of surface area. They sell new pretty cheap, so might be something to consider versus a cooler specific for a transmission. Cut the fitting ends off and use a high pressure hose to connect your steel lines together. AC Condensors are pressurized right? So should hold up just fine. https://www.summitracing.com/parts/s...yABEgIIfPD_BwE
So go for it, but do keep us posted as I want to hear what your thoughts are on how the switch pitch works behind a Pontiac. I know the Buick guys used them and they made some impressive 1/4 mile runs with them.