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Trust me I've built many engines from 4cyl through to 12cyl. Im not saying it wont work im saying it wont last.
Here is sorter the point Im making, there is alot more to metal work and gaskets and building engines then people think - its why a proper built engine is always expensive
"Don’t go smoother than 40 Ra (240 Rz) or rougher than 100 Ra (600 Rz) with a gasket. Rougher surfaces limit gasket conformance, while smoother surfaces increase the tendency for gaskets to flow, reducing the gaskets blow out resistance."
What ever you do dont spray the copper on anything other then a standard compo or paper gasket, spraying on mls or anything else is actually doing it harm.
Just trying to give you some experienced advice and save you money in the long term.