i think very high up the list would be a roof chop that chould help gain much speed, as for powering it. a pair of the bigest enignes i chould get my mits on cheep, as weight don't really matter as far as V max is concirned and weight would probaly help keep it on the ground a pair of r32 lumps.
both would be boosted but the boost would be supplyed from a turbo but driven by a small gas turbine ( namely another big turbo with a flame chamber bolted to it )