Same as David, 2.3L. The 1.6 that they had the gall to offer on the 454 realistically is undersized for even my 350 as I can only get about 4psi pullied down on that in CO.
Got a couple more pics of this beast, it is comically large. I didn't realize how much they moved in the back of the truck, but it appears I'm using all fronts on 4 corners so that doesn't help. I think I want those Lance struts that go into the wiper cowl area to help further stabilize it after that. Part of the way it drove on the way home was caused by a tie down coming loose from the camper settling, so when I hit a bump the thing would jump up a few inches and jerk the front of the truck up. With it scooted forward more and tied down tighter it doesn't do that anymore. I replaced the 2 2x6s with a single 2x6 with a piece of chip board screwed to it, this got it nice and close to the front with just enough clearance not to touch and the rear black tank cover has about 1.5 finger gaps worth of clearance. Even freed up a little wiggle room on the camper harness so it has some slack now.
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Looks like a damn motorhome, it's hilarious! Duallies kick ass. Time to mod.