Mostly stock 340 engine what Spark plugs

Man this whole SB and 340 thing is still foreign to me lol..I know exactly what plugs my RoadRunner took with the 383 :) but I have no idea what the 340 should take pretty much stock 8.5 comp ratio with a stock grind cam and headers..what should I get/use? Most of my search results turned up guys asking what to run on 10:1 comp ratio engines and strokers..not really anything on what STOCK plug to run ..