AMEN ! to the above - only I will add that the 275 hp advertised rating on the 340 was underrated. I think about 310 is more accurate, and I think even been proven.
I thought mopar muscle magazine rebuilt an early 340 to stock specs which was probably about
9.5 :1 (stock) and it dynod' 281hp.A stockish 7.8:1 318 may struggle to reach 325 through manifolds and small heads / valves.
..but as most agree, numbers are just "wow factor"..how it drives is what matters.