This happened many many moons ago while strolling around Billing show, RPI were showing off their new stainless exhaust bending machine and I decided to ask if they could bend me up a snorkel, Chris thought that was a great idea so they did it there & then, a stroll past the Mantec stand turned up a shop-soiled V8 snorkel top for a bargain price and that was it - a couple of exhaust clamps secured it all and it did many years of sterling service.
With the carb setup - very nice little air filter welded up by Tonk (thanks!):
And with the mostly-flapper EFI (later Megasquirt):