Are the adjustable jet plates for holley's "marine approved" or a good idea for a marine engine? I am looking at the percy's adjust-a-jet, altho I think there are others similar. These plates basically do away with jets and have a needle that regulates fuel, and is externally adjustable. The external adjustment part makes me suspicious that it isnt cool for marine use. I know the old saying.. jet it, set it, forget it... but the whole process of dumping bowls of gas all over the place to change jets doesnt seem very desireable to me anymore. Thoughts?