I am building an amphibious vehicle (aluminium hull 20 ftX8ft. at Gvw5500#the null is 6* degree dead rise there is a slight rocker in keel about3 degrees. boston whaler or sea sled type hull with wheels in outboard sponsons. is a 350 chev /powerglide .powering an american turbine up to it? how do jet drive perform at lower speeds.gas consumption? or will it plane? do i have to always get it up on a plane? need estimate on planing speed, rpm and h.p.?