Originally Posted by Pesky Varmint
Not exactly but close- the Allison and Rolls Merlin/Griffon V-12 aircraft motors that North American used are almost 4 times the size of the Falconer. He got his motor FAA approved and sells it for use in P-51 replica that's about half-scale. You can see one here-
The Torque was built to be exceptionally reliable and if they can work the bugs out, the cost/benefit ratio to big blower motor will make them a virtual giveaway.
As far as size, the motor has a much lower height (CG) and since ther's no blower/intercooler/etc the weight differential shouldn't be significant. If you are talking about an iron-block V-8, that difference should be about nil.