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<< I think the keg is for during the resto. When you're nearing
completion, you can swap in a petrol tank ... >>

Whilst I like [and somewhat agree with] your idea RD,
I HAVE seen "beer kegs" at sanctioned NHRA Events
as them seem to be accepted as "Fuel Cells" due to
the actual 'design' of kegs -:)-:)-:) !!!!

Ed