mine was a daily driver (1989 GQ TB42 petrol/Gas)
1 day a week, I would run it on Petrol for the trip home from work

mine was professionally tuned (by a guy who used to race) as I spent most of the time (6.5 days out of 7) on Gas
hence why the Kws were so similar (96Petty / 93 Gas) but I could still spin an 11R15 on a dry bitumen road in Gas when I wanted to

mine was a Carby, with a Sprint Gas Mixer on it
Sprint Gas.jpg

the guy around the corner from me had no end of trouble with his,
he had to start his in Petrol, wait until it warmed up before he could flick it to Gas
to go from Gas to Petrol, he had to be stopped on the side of the road, as it would not switch over right away - as he was going to "fred Nerk Automotive" to get it tuned - as a Gas tuner, he made a great fisherman


mine
start on Gas........
run on Gas.......
flick it from Gas to Petrol while on the move
flick it from Petrol to Gas while on the move

yes I had electronic ignition - (played with an Automag Magneto for awhile, but without success)
yes I had the rotor modified
yes I had top quality Leads
yes I had top quality Gold Tip Plugs (the BPR6E were about $2.20 each I think at the time, and the ones I was getting were around the $10.00 each mark from memory)
yes I had a guy who used to race Gas Cars do my tuning for me - was never successful when I did it
yes we used the proper Lambda gauges to get it running sweet