New Owner, Transmission swap

Hello,
I recently picked up a 70 340 auto console. Really like this car except for the automatic transmission. I am seriously considering doing an auto to manual upgrade but I see a lot of different information on doing this throughout the web.
The choices I am considering are,
-Tremec 5 speed
-Tremec 5 speed with hydraulic upgrade
-Passon hemi overdrive
-Brewers 4 speed conversion (believe they're out of stock)
I have a quote from Silver Sport for the Tremec but the rep said that it does not come with pedals, z bar and linkages as well as the fork pivot. The rep did not know exactly what was needed additionally but suggested that I contact Brewers.
I've also heard that if I go with the non hydraulic upgrade, I would need to weld the pivot ball for the z bar to the frame and modify the tunnel.
This is a project I am planning on doing over the winter months but I do not want to do a project that is out of my scope. I've replaced engines, transmissions and clutches in the past but have not tackled a job that seems like a major undertaking and screwing something up in my car.
Any insight is appreciated. Thanks!!

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