wires & hoses all the same.
Your question is all about the short-block. OUR answer will be based in your intended application. Being a Convertible doesn't decide 350/400. But the rear gear may.
If a 2-series (2.73:1, 2.54:1) then 400 engine. If 3-series (3.08:1, 3.23:1) then 400.
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