Wow, power to weight (and traction) means more on the strip than anything else, as proven by a 69 COPO 427 Chevelle racing a ‘71 Duster 340 at the Pure Stock Muscle Car Drag Race 2025, and only winning by one 1/10th of a second... 12.0 to 12.1 for the Duster.

very similar top end speeds too... 114 and 112. 

That 340 is a damn good motor. 

I want to emphasis.... a STOCK 340 Duster damn near tied a COPO 427 Chevy. Seriously, why waste your money on a COPO 427 when it's not any better than a 340 Duster that likely cost 1/3rd as much, and has parts that you could replace from a junkyard. You are not ever going to get COPO 427 parts in a junkyard

A 440 six pack road runner at the same race pulled a 12.54 at 112. So... damn, that 340 Duster was perfectly set up and 4/10ths faster than a 440 A12 Road Runner