Thermoquad Info
++ on a early Thermobog. I am running the original one on my 73 340.
It has a .508 Purple Shaft cam and long tube headers. It will idle for 15 minutes and you can nail it and it will blow the tires away. No muss, no fuss-just instant let's see if we can suck the hood thru the carb.
We spent a day getting the secondaries to open just right and it was time well spent.