If you take it to BJ make sure it is listed for Saturday only. Then again it better be top knotch to make it there period. As mentioned above, keep in mind correct stripes, wheels and correct emblems to appear period correct. Keep the 428 and include the 390GT motor crated for the next buyer. My .02 worth...
Randy
You have no say when and what time it will cross the block. Everyone wants prime time. The reality is, only cars that will draw big bucks will get prime time.
I have sold several cars at BJ and am a bit familiar with how they work. Getting your consignment application in super early does not guarantee you of early placement. The cars that get placed early are cars they want to advertise their various pre-auction mailings, and here again, they are prime cars.
BJ takes all sorts of cars, not always the creme of the crop. They have many hours to fill, and #3 cars sell and make money for them.
Getting back to your car, it has been said previously, if you are willing to spend money on the car to get it back to a nice stock looking car, you would benefit. As an S-code car, I bet it would do better than with the wrong motor in there.
The question then becomes, is it going to get you enough to cover the additional costs to get it back to stock.
There are also costs involved with BJ. You have an entry fee of about $500. Then you have transportation costs. There is a cost to park in under one of the tents. Let's not forget the cost to get there and stay for a few days, and the 8% sellers fee. It is not exactly a cheap way to sell your car, and being a no reserve auction, it sells at any price, whether you like it or not.
BJ is not the instant success people think. Don't be fooled by what you see on Speed Channel. There are hundreds of cars that sell for quite a bit less that you never see.