G'Day Jack,
I did this conversion this year into my 77 308 Pano. It had the M21 and the std diff, 3.37 something I think. There are a couple of Supra boxes, ,make sure you get the one with the steel 'sandwich plate' in there, the totally alloy ones are supposed to be weaker.
You will need a bellhousing and a crossmember (or modify your own). Depending on the type of clutch you have you may need a new cable and brake pedal. You also need a clutch and throwout bearing to suit the Toyota shaft and a new spigot bearing. All this stuff you can get from Dellow or Castlemaine Rod shop or Kingswood Country. Keep an eye out on ebay and Gumtree too, I was able to get most of it there. You will need to shorten and balance the drive shaft with the Tojo yoke on it. If you have the Box then the big cost is the bellhousing 6-800. Clutch about 400, cross member 2-300, pedal -100, drivesshaft 400.
Good news is it works well, you get a quicker take-off plus lower revs at cruise. It drops the revs about 400 at 110.
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