Wish I could give you more than advice, but I think you will have trouble as those flat beds were only made back in the 70-80 era and I doubt that there are any parts around other than those that can be had by posting for whole birds to use as parts.I would imagine that it would be easier and better to just use the fuse and put it around a modern day mechanics , as those flat beds usually had heating problems in the gearbox as well as the engine and just weren't geared right to fly good.

Good luck
Larry