Mike,Martin had that set up on his Southern which had a good 347 engine. with an HP 650 Holley running just one pump at a time. At Le Mans on the track where it is flat out most of the time the pump could not keep up and it ran lean and melted a piston crown. Luckily when the half moon shape on the piston top came off and stuck to head it did no further damage. The head cleaned up OK as did the bore so only a new piston needed. Spoke to Kenny Coleman who did the rebuild and he suggested the Holley pumps (self reg) and high flow filters as he thought the Facets/ Filter Kings were not enough for a 347.
However I have been using this set up on my 302 and it has been happy for 20 years.
You did tell me Martin's driving style meant he used to go around roundabouts at 45 degrees in his 40, so I expect that did not help things