Quote Originally Posted by NTFDAY View Post
That appears to be an early Holley and I doubt that it has power valve blow out protection. I would strongly advise that you install the blow out kit during rebuild. And just out of curiosity what is the number on the metering block? A 650 is 4777.
Yep, I had planned on it already. You're right. It's 4777 on the metering block.