My Lewis winch came from Bailey's in 2000 and I purchased a 394 to power it at the same time. (For several years I ran a 371 as the power but recently switched back to the 394). I purchased the 394 after speaking with Lewis about the ideal saw to power it. The newer version is even better than mine and you should have an even better experience than I've had.
I help a friend of mine mill redwood which often come from yards close to houses. We often can't get even a reach forklift in a yard to move the logs so we use the Lewis winch and a suitable anchor point. Do NOT try to run the winch unless it is sitting on a block. You may want to keep a 20" or so long piece trunk 18" in diameter for this purpose. A light wood like pine or cedar works fine. If the winch is off the ground and in mid air it can spin and you will not be able to hold it. The saw or the winch can be damaged. I have a 3' long piece of 1/4" alloy chain encased in 1" fire hose attached to the winch. The chain terminates in a swivel hook so I can attach it to a master link or loop in wire rope or a nylon sling. Most times I use a 3' endless nylon sling looped over the ball of the combo pintle hook on the back of the truck. I haven't tried the cant hook type anchor.
When you hook up the winch to a saw don't forget to turn down the oil pump to the minimum setting or you will waste oil and make a mess. After using the winch for awhile I cut 75' off the end of the rope so it would be less hassle to guide the rope on the drum. I have had to hook the winch to an anchor and pull the wire rope with the truck to get it unstuck after an angled pull. I took the winch to a rigging shop and had them put on a becket and a small pear shaped master link as a termination. A small screw pin shackle, 1/2" or larger, works well to hook to 3/8" chokers or rope slings.
You will learn when unspooling the rope with 2 people that the winch operator should always keep one hand on the break to stop a bird's nest before it starts. Trust me on that one. My winch uses a 1/4" roll pin as a shear pin (weakest link). It came with a 1" long pin but I switched to a 1 1/4" pin. The extra 1/4" in length makes it easier to drive out. You will need a supply of spare roll pins, a 1/4" pin punch and a hammer. You will break pins and it only takes a couple of minutes to fit a spare.
Always pick up the winch/saw powerhead by both handles so you don't bend the bar (if used). There are safety precautions as for any winch such as never step over or on a rope under tension, never stand in the bight, wear gloves when handling the rope, wear a bucket. Don't let kids, dogs, or anyone else near the winch/rope when under tension.
Finally you will need to develope a feel for the winch. It will pull small trees and small logs very wll but you can overload it. The pin will break and the load will slide back, this WILL happen until you learn the proper feel. Once you get over the hump you will become a valuable resource to local cutters. Have fun and stay safe.