appearance of a 340 vs. 360

question guys: It has been a long time since I have had a 340. bout 30 years I guess. I know you all can answer this in no time so here goes. If you are standing in front of a Mopar, any Mopar looking down at a 340 engine or looking at a 360, what is the difference in appearance if any. without checking the numbers can you tell the difference in the two just by looking at them. And if you were going to build an engine from scratch, nothing radical, just bore it .030 over, cam, x-heads, intake and carb to match.......... would you do a 340 or a 360. I have heard a 360 would give you more if using the same components. My sons car has a 360 in it now and I have 2-340's down in the garage sitting. One is a 69 and the other is a 70. I was gonna go with the 69 and put the 4 speed behind it for him. what are your thoughts on this.thanks,Bill