You won't want that lopey idle when trying to maneuver over an obstacle. Those cams are that way because they are designed for high RPM power. They have nothing to offer in the lower RPM ranges, where your Jeep would be spending most of it's time on trails.
As for 351w or 302, the 351 has more cubes, so it will have more output from the start. If you want to build something with power, go the 351w. Just remember that the bottom half externally is the same as a 302, but the top is wider, so clearance is gonna be a little tighter for the steering shaft to headers and such. The advantage is that 302 motor mounts and such should fit it in there. You will also have to find a oil pan that fits, I think the one from the cars are needed, and there weren't many 351w cars, so an aftermarket pan for a mustang swap or something may be required.
1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy
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