What kind of gas mixer do you have on the engine? If its an Impco 200, you'll gain 25% power just by replacing that.
As for changing ECUs and computerised ignition systems, I wouldn't waste $10K there, I'd spend most of it on a hi comp top hat linered exchange 4.6 so I'd get reliability. About $1K on the gas, tops, new radiator and bits, ignition module upgrade (or Scorcher dissy) and your money would be almost gone.
Oh and unless you have rear chassis mods, your LPG should fill to 70 litres, no more. APA twin tanks are 44 litres water capacity each, 80% is roughly 70L.


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