Wally,,,,, we're you having problems with vapor lock. For every one else,,,, you should go to Wally and Sue's blog. Just do a general search. You'll find it. Wally put FI on his 455. He built just about all himself. Right down to soldering the controller together. Bungs on a stock cast iron manifold. Did his own valve job. And his engine is a jewel. He's now putting FI on his onan. His weedwacker is probably next!!! Make sure you check out the "Quadrajet throttle body".