Definitely an interesting concept. I remember a few years back a real 1:1 dragcar builder used three 351 Cleveland heads to make a head for his six-cylinder powered car. He cut the front two chambers off one, the middle two from another, and the rear two from another. He used some form of exotic pressure-brazing concept to put them all together and bolted it to a big-bore Ford 6 cylinder. Can't remember induction used, but supposedly it worked pretty well. That being said - why not an Ardun 4 cylinder.