'67 C10 SM420 to Turbo 350 question

[xtinc]

Hi all,

I'm new to the board and Chevy trucks. I recently purchased a '67 LWB with a 350/4sp. It's a little ruff, but overall in good shape. I'm not a big fan of the 4sp trans currently installed and want to swap it out with a TH350 Auto. I plan on purchasing a Lokar floor shifter to go with the trans.

Hoping someone could help me with a few questions
1. What size transmission shaft should I get short or long?
2. Can I use my current drive shaft?
3. Besides an auto flywheel, auto trans mount, Lokar shifter, transcooler, and fluid lines, will I need anything else?

Thanks in advance for the help.
Tom