To be completely honest, I don’t think I’d go crazy with cubic inches on this deal. A big block will certainly make the power more easily but along with that comes low speed torque and on salt, on a 5” wide tire, you’re in for a hell of a ride. Think 150 mph burnouts. I’d focus on a small cubic inch, very high winding, very efficient, turbocharged deal. Something that makes the power number up top and is happy to rpm in the 7500-9500 range.