I believe you'll get more torque out of a longer stroked crank. The 360 crank will do an OK job... but if your like me....you won't be satisfied. The 390 has a little more stroke. The difference is 3.50 for the 360 and 3.78 for the 390. If you can find a 428 crank, that would be the way to go. The 410 FE motor came with a 428 crank also. You can probably pick up a set of C6-H or C8-H velocity heads that will work just fine for a lot less money, unless you already have the 428 heads. With tires that big you'll need the torque to get them going especialy if you're going to do some serious off roading.