Value of a 340
Threads like this are breeding grounds for debate.
Basically in N/A form /6 and 273 are too small for any serious hp level. I'll add 318 to the list so 318/340/360 all relatively will have similar potential especially in the street range of 250-450 hp. The powerbands will be about 300 rpm apart and the gear needs will be a step apart for each. It comes down to preference. Above 400 hp I'd be seriously thinking about going big block or stroker.