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If you're stuck on the other two options then I would say go 416...If you are thinking about it now, you're going to do it later...when you do it later you're going to have to put in a different cam at a minimum, possibly different heads depending on what cam goes in there you may want to mill the heads for compression or get different chamber sizes anyway.

You're probably correct on your long block selling price of 2-3k...maybe a little more.