This size Holden came standard with 350ci SBC and TH400 (in 1971-1974 HQ) and the HJ facelift was designed for a 400ci SBC. Myself or someone else here will be able to show you the bits you need to convert it. Keep the original 308 block in case it ever comes back over here.
You will be able to modify the crossmember and shorten the tailshaft there, but will need a tailshaft end with 1.125" uni for the TH400.
Bits you will need to buy from over here:
Engine mount adapters and mounts.
Speedo cable.
T-bar and harness.
Console insert for T-bar.
Radiator hoses.
TH400 rear engine mount (heaps thinner than the one on the 4spd).
Things you'll need to modify:
As already mentioned, tailshaft and gearbox crossmember.
Radiator (bigger core and swap spouts around) or buy new one from here.
Engine end of throttle cable bracket.
Engine wiring harness (use 308's senders).
You can buy off the shelf headers over here too for SBC into HX with TH400.
You want the TH400 with the tiny 4" extension housing too.
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