Not yet. Gave up on fitting the 540 in and am now working on putting back in the 499. The carbs will get tried on then, but probably the 2" Dom will be all it needs.

100LL gas can sit in your lawn mower all winter - outside - and it will fire right up the next season. No gum, and no jokenol so no issues with corrosion of the jets. It is a slow burning fuel I think made for engines with bores much bigger than we run. Bores so big it takes 2 spark plugs to get the fire lit evenly.