I just happen to have a couple of Atlas 4.2 engines on hand, and one spare head. Sometime soon I'll dig out a stovebolt head gasket and compare cylinder spacing, width, and coolant passages to see how closely they would compare. I have an idea a solid plate bolted to the top of the block could be drilled and tapped for studs, and coolant flow could be routed from the back of the block up to the head, then forward again. It also looks like the cam drive could be converted to a dry belt instead of a chain.
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