Question about the price of 340s
In my opinion the problem with the Chevrolet 350s and 302 305 or 307 is Most were pretty mundane and complete dogs in stock form. I regularly smoked Chevells and Comaros with small blocks at the street races in early 90s with my 318 68 Satellite . Yes there were some special order options for 302 and 350s that made a lot of power but at the local street races we never saw them. Now line up ANY 340 and you knew it was going to run hard. Maybe not the fastest thing but always was strong. How many of us have waxed some brand x car with an A body 340 only to get asked if it was a big block after the fact.
That is where the 340 reputation comes from.