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I did this swap on a 68 with console, had to replace the flex plate with one that had two bolt patterns, large and small (three holes for each), bend the cooler lines to fit, and set the shifter up so when in second gear in the trans, the shifter said LO.
I would think your column shifter would work the same way. Just put it in park, with the trans in park, like you would for a PG. You won't be able to select first gear manually, but most people don't anyway.
You can use your PG trans yoke, I don't know if the later TH350 would have a larger output shaft? The spedo cable should work, the trans mount is the same, the trans length is the same.
It was like a new car with the new transmission, you really need a passing gear, and the old PG was allways at the bottom of high gear when passing.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Can Am Vintage Racer