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Dave, I would wrap up the original motor in the garage and put in another motor if you want 400hp to "drive" around in.
fwiw; that's what I did with my Chevelle.
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Dave,
I'm with XBM. Take your original motor and store it in the garage. Heck, rebuild it stock and keep it on a stand. Get you a good finished motor that has the HP that you want to drive and go with it. Best of both worlds, retain the value of the born-with motor and drive a hotrod.