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

448Scamp said
No sense measuring anything if you are just going to run it. When the main bearing clearance is .0022 plus a couple of tenths minus zero and you have a journal with .0003 taper it’s already out of spec. I won’t run that. If you measure the bores and it has .0010 taper it will take another thou and a half to get it straight so that means the bore will be too big for the pistons. You can measure all you want but if you are using the FSM tolerances they are so sloppy it’s not worth measuring. Maybe you should go hang out with some real engine builders and see what they do. Unless you don’t want to learn little buddy.

of course you measure it, then you 'know' if the crank journals are within spec or if they do need to be ground and you 'know' if the bores have too much taper so will need to be bored or not. measuring is cheap to find out if machining (which is expensive) is required or not. your checkbook approach was made very clear in this one post, leave the rest to the cheapskates.