[RodKnock]

Well, hypothetically speaking, if you assume the "two-roll bar" issue doesn't exist, I would more than likely pay, as my premium over a 390, the cost to locate, purchase and build a 428, less any adjustments for mileage, or other detractions such as replacing any "disco" parts. As I said, all other things being equal, like two ERA's built exactly the same, the 428 would have a premium of a couple or few thousand FOR ME.

However, if the ERA with a 390 were discounted $-wise to a point relative to the 428, then I would buy the ERA with the 390.

Edit: As Gunner said, CJ's, PI's and SCJ's add more value.