Must watch what i say i might ruffle David"s feathers again! I could give you one sucees story one after the other on Ruperts carbs but i wont get in a pissing contest. I now run a Bolaws system on a 565BBC. I had a Terminator Fuel Injection system from Rons that i ran on my SB chevys for 4 years. I will say it will pick your ET up a bunch. I could move it back and fourth from my 377 to my 463 and do nothing but change the pills. It was also very consistant. The only problem i had with it was on my 463 was when it got cold it was harder to start, it had 16-1 compression. I also had an electric primer on it that worked really well. The only thing you dont want to do is go playing around with the barrel valve. If you need to richen or lean the barrel valve you should call Rons and let them explain it to you. Once you have it right all you have to do is change the main jet from cool weather to hot weather. Thanks, Don