G'day Richard.
I'd have to say yes on the A7SS racer. I never did a dyno but she got closer to the pointy end, a lot more 650's & 750's behind than in front. She was 2 mile per gallon thirstyer, I got better mileage out of my 4.2Lt Landcruiser.
I'd also say yes on the A7 plunger. The look I get from modern pilots when I'm only 50 meters behind at the top of Barrengarry Mountain.
Cheers