I just got off the phone with Keith at Wilson's and just as I suspected from the start, I need more velocity. He asked if it was laying down in 3rd gear. Yep, he says with the big ports, the fuel is falling out of suspension and never being used, just going out the pipe . He wants heads and intake to inspect. He says everything can be adjusted in the intake and most dont know this. It will take lengthening the port and making smaller with some welding, $1675. My thinking, a smaller intake cost way less, but I dont think there is another brand 4500 lo deck available. In the end he said compression would be my friend in this situation. Low compression such as mine is allowing fuel to fall out with the big ports in this combo. Looks like I'm on the right track.