i have a spectra 20 with a 12jc jet. has a mild 460 ford in it. needs a rebuild in pump any recommendations on size of impeller i should use. I'm sure its a stock pump and has a loader in it. ( I bought it this way) the boat planes good and mid throttle it seems the motor is to free and don't have much load against it. If i smack full throttle the rpm shoot up and the boat does go but top end isn't to much. I use this for a cruiser and not anything else.