You can make a 1967 400 block live at 1600 HP but it would take a LOT of work (machining) and for your application a 421/428 4 bolt main block would IMO would be
a much better place to start.
The main webs are weak in the 65/67 blocks and the cast steel is not great.
A 67/68 4 bolt main block would be a much better starting point with some good rods and a "N" crankshaft.
No need for a set of high dollar heads or crank (with a engine built for "looks") BUT
the roots blowers do add a lot of stress to the #1 and #2 main area of the blocks and a cast crankshaft.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
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