Today, dollar for dollar, is the 318 faster than the 340 ???

correct? A side note I had a good friend who passed away a few years ago. He made his living building race engines on a national level . He wouldn't touch a block if it need line bored or if it had spun a main. For any kind of performance build He also wouldn't touch a block that had core shift out of his specs for any kind of performance build. Maybe and that's a big Maybe a grocery getter build He might use one of those blocks. He also designed all of his own camshaft profiles according to the flow bench numbers after he got done porting.