All UTV's Building a UTV. Inline 4 cy engine best idea?

[BldnUTV]

I'm in rock racing but new to UTV's.

I'm going to build one but don't know what motor to use. I'm thinking of a 1L I-4, 1000 cc, 50lbs torque at 3600 RPM's but is only rated at 35 horse power. UTV will be somewhere in the gator/ranger size and weight will be somewhere between 1,300-1,500lbs empty. Maybe 2,500-3,000 loaded. Possible put a CVT on the motor.

What do ya'll think? Any other options that can stand the abuse of weight, little water, mud, etc?

Any help sure will be appreciated.

Thank you