1972 C-10 "Insert Catchy Build Name"

[Reendog89]

Hello and Greetings to All,

This is the start of my build thread for my 1972 C-10. I have had the truck for about a year now. I bought it from a marine 1st Lt who was deploying to Afghanistan, again. It was his baby and he put ALOT of work into it. After buying it I too went on deployment. Because of the deployment I have not had much time to work on the truck, but that's all about to change.

Build Pipeline:
1. New transmission
2. Seal/undercoat frame/pans
3. Fresh paint
4. Interior update

Does anyone have suggestions for the above numbered items? I am looking at buying a TKO600 kit from americanpowertrains.com. Has anyone used or heard good/bad things about this company.

Feedback is welcomed and appreciated! This is my first solo build!
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[Reendog89]

Here are pictures.

[Reendog89]

Specs and Tech:
-350 V8, bored 0.30
-Elderbrock 4-barrel
-4 speed muncie
-Eaton posi unit
-Richmond 3.73 gearing


Listed below is are the details on the TKO600 kit that I am thinking about buying. Thoughts?
-72 C-10 350/375Hp/255.70.15/3.73/bench
-PFGM-12016, TKO600.64 ProFit Kit for Street Rod/Truck/SUV Chevy, Kit

Includes:
-New Tremec TKO600,
-Frame mount crossmember
-HD Polyurethane Isolator,
-PST 3.5" DOM Driveshaft,
-Cryo Treated TKO Slip Yoke,
-Cryo Treated Solid U-Joints,
-Custom Speedo Conversion,
-Calibrated Speedo Gear,
-HD Pilot Bearing
-Weatherseal Reverse Light Harness, 5-Speed Shift Knob,

Seems like a good, complete kit. Or should I go for a 6 speed? Anyone know if a 6 speed with fit without tunnel modifications? I talked to another company, Keisler Transmission, and they said that a 6spd would not fit without "major" tunnel changes. American Power Train disagreed and thought that a 6 speed would fit fine.