Which engine is more valuable 427 or 428CJ?

[cobranc]

Thanks to all for your input. I am relatively confident that it is an 428 block, as the cylinders measure 4.160" plus or minus a few thousandths. That would be either a 406 or 428 block bored .030 over. I plan on doing some more investigation to find out for sure.
The reason I ask the question is that I purchased the car from one of the big collector car auctions and the car was announced as a 427. Since this is the main reason I purchased the car, and paid what I did for it, I wanted to know the difference in price of the two motors. If they are the same value, then I do not have an issue. IF they were different, I wanted to make an issue of it. I have spoken to the auction house and they are willing to work with me IF the car does not have a 427. Since the cylinder bore is much less (in cylinder terms) than the 427, it cannot be a 427 block.
I am also planning to change the tranny from a Jasper C6 to a TKO600/T56 and wanted to make sure the cars value was worth making the swap. I also know that you never get out of these cars what you put into them, but I didnt want to put lipstick on a pig either.