I have a 77 spectra 18' that has a ~400hp 454. The pump I i believe has an A impeller, is all stock appearing including the rock grate. it does have a hydraulic place diverter. I am looking for some more mph from this boat. I plan to go to a b impeller and new wear ring during the off season but would like to try some other things out in the meantime. My question is what would be the next item(s) to try. I have been looking at the ars bolt on shoe and ride plate. Thanks!