You then want :

HT-mid HZ V8 3spd.
HQ-mid HZ 4spd except HQ 350.

6cyl 3spd clutch setup will be OK if it is HQ or HJ. You just have to swap one part to make it work on a V8: the bracket that bolts to the bellhousing.

Any HT-VSIII V8 flywheel that isn't one of those later stupid dual mass setups will do.

For the 4spd just buy any aussie 4spd. It'll all need rebuilding anyway and you can buy all new bits for them. The only V8 bit you'll have to track down is the input shaft cover if you get a 6cyl box. I can probably sell you an M21 3rd gear if the box you buy is an M20 or M22, and you'll need new input shaft, 1st and 2nd gears, synchros and bearings. It is very rare to find good secondhand boxes nowadays and apart from 3rd gear the bits that need replacing are those that make the differences between M20, M21, M22, XU-1 and L34 boxes.