Stock heat range plugs are most definitely okay for a 50 shot or less.
Make sure they are copper or if you want to pony up the cash NipponDenso Iridiums. Don't bother with NGK's Iridiums and that's rare coming from me as their other plugs are good.
For that matter Autolite has a new line of dual tip Iridium plugs. (Extremes)
Make sure to close the gap up a bit. .045 should be fine for that range.
