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Every engine has its strengths and weaknesses. The Caddy has plenty of issues, and few parts available. Stay with Olds. You can build it to make lots of power and parts are easily available to fix any issues with it. Cubes aren't everything. If the heads won't flow, more cubes won't help much. You can end up with a stout Olds 455 with a lot less weight than the Caddy would have using readily available stuff like aluminum intake and heads if you later want to go that route.
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