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William, are you sure you are searching for the right engine?
The graymarine fireball models were V8-238, V8-225, V8-188, V8-170 and the V8-135,
I have all the factory svc manuals and specs, part numbers et al for these engines.
The 238, 225 and 188 were built on the AMC 327 cu in block
The 170 and 135 were 250 cu in.
They also made what the called the compact V8-178 (dual carb) and the compact V8-138 (single carb) both 250 cu in.
I got the manuals from this site a few years back, don't know if they still handle them