I had discussed a tri-power set-up with Joel/Motion when I had ordered the car and though it does look
under the hood , it was decided to go with the 3 barrel for all out performance with the 456 rear. --But if someone wanted this set-up no matter what ,it could have been put in, Motion did do several articles on dealing with any tri-power gremlins----------I know Nickey advertised and put them in--I think also there is a Dana with A TRI-POWER setup---I never read about a MOTION car having one new or never seen one, but I've learned to say "Never say Never"---But I would think Motion would have tried to talk you into using a 4 or 3 bl-carb.------------