To answer some other questions the reason why I am thinking of doing the 318 is because it is different and the org engine to the car. #2 is because it is about 100 lbs lighter than the 400 not to mention a 904 is 35 lbs lighter than a 727 and with less loss. I figure it might be close in performance because of those factors.

I am considering the 400 because of its bore size, transmission, and because it could make the car worth a little more potentially but, value is not at the top of my list. Just wasn't sure how close it would be because I have heard of 383s and 400s getting 20 mph out on the open road which is where my LA-headed 318 is now.