Old School 340 Build

The value job is 20 years old, Mike lapped them and installed new seals. He said the intakes are stock 340 Chrysler and the exhaust valves are some kind of after market.
The heads flowed 241@500 when I brought them to Mike, when the Dyno runs ended and I was a bit puzzled with the big numbers he admitted that he touched them up a bit more one night when he was bored!
When you said some porting, 240's cfm is how I interpreted that and believed some others were a bit optimistic. Had it been known from the start they were actually well ported...the guesstimates would have been closer. Lol I don't really get excited about the huge carb and headers on the dyno because they're not usually what the motor wears out of the dyno room, aka in the car it will make less unless all the same stuff is used.
mine had basically stock heads and 30k miles, with the info you posted, i say my guess was accurate based on that info.
Gotta chuckle at the ones saying they curtailed a well known builder with their guess, wow there...I'm always amazed.
Op I'm guessing the heads flowed 250's /190's, can you share that info for the hell of it?