Sounds like a good solid plan. Doing everything right the first time is the way to go.
However as tothe edelbrock manifold, it never showed me very much promise. We had a 455 on the street for several years and have one in our 1953 HENRY J drag car and found great success with an Offenhauser 360 manifold. They come in single or dual 4bbl styles. They are readily available on E BAY for very good prices. Just look on the Offenhauser section.
make sure you do the oil mods to make this engine much more reliable and live longer.
I would look into a good set of headers as the biggest flow problem we've encountered is on the exhaust side.
Other than that, it looks like you've got a winner.
Good luck and keep us posted.
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