IHI RHB31 from an F6A. Running 10-12 PSI.

There are several options. None are a bolt-in fit. F5A/F6A import 5 speed. Same final drive ratio as an F8B, just a different spread between gears. Requires matching flywheel and starter, and custom driveshafts. Matiz F8C 5 speed. Starter motor placements creates difficulties, and the cable shifter ...

Unreal - needle in a haystack!

Well you made that look easy! Where you end up sourcing it from?

Coil was still hanging on the loom.
Mitsubishi
33410-70B5
H003T01072

Haven't had a chance to pull a belt out of an MB to compare yet sorry!

There are very few grey import MBs in Australia. All of the Aussie delivered models will have an ADR plate on the bulkhead, and most have a Suzuki/ATECO plate on the upper radiator support panel.

I know some owners have gone to great efforts to eek power out of the F5A, including raising the compression, bigger carby, extractors etc, but I reckon you'd be hard pressed to get much more power than what a stock F8B puts out. 

Around $1200-1500 with a universal loom.

An english version of the F6A manual/wiring diagram has been the holy grail for many years. I can't help with the specs, but I can see if there's a factory coil attached to the loom on my spare F6A. The model number might offer a useful lead.

Theoretically yes, but the combustion chambers, ports and valves are difference sizes.

You're likely to find an ECU pretty easily by hunting on Yahoo Auctions, although the wiring loom might be a bit more difficult to source. I don't like your chances of finding either floating around in Aus. If you've got a bit of coin I'd recommend grabbing an Adaptronic or Haltech ECU. Adaptronic h...

Sorry, no. I will check it out tomorrow.

You set the gap correctly yeah?

Using a Hatch works out well, because the bonnet is flatter and the side wings are higher. No clearance issues for the manifold!

If the spool mechanism is okay you can rebelt them. Rolls of belt material are pretty cheap on eBay.