Ken are you sure you cant refurbish those engines ?
Gotta love the Harbor Freight Gantry Crane. Sure comes in handy. I widened mine a little as there is room to move the two vertical legs out a couple inches on either side. I have 98.5 inches between the verticals now and I think I can go wider still. You will have to drill some new holes...take a look and you will know what I'm talking about.
strick