The Plan was always a Rascal with a mid mounted built yank block. LS7 or similar. Blown obviously - with the side panels or roof modified for air collection duties.
Then hook up the rear wheels to some sort of very modified heavy duty rear axle and a 4 speed box (no need for more with the torque eh?) and whack some wheels with drag radials on the back.
But the idea of a EJ25 and the scooby rumble sounds good.
OH! I forgot the purpose, and one extra component that might be needed. Wheelies! How funny would it be sitting on the motorway doing a wheel stand in a bedford rascal! Might need a wheelie bar though.
One day ..............