Opinions wanted for replacement Rear Spring selection. Thank you

Hell yeah, the smaller bore pulls the air in faster making better cylinder fill. so even tho smaller displacement, I've heard they make the same horsepower. put a 340 air cleaner on & theyll think thats why you kicked their ***.
Most people don't get that it's all about velocity! Ohhh i flow 330.. yeah well i flow 280. but FAST!!


P.S. oops.. OP showed up.. back on topic :)