Engine knock on 1990 Mercury Cougar

Had accelerator stick open for 3 seconds with no load Now have engine knock when accelerating Will still run with power and does get louder as engine warms up. 1969 Cougar Convertable with 390CI

1 answer 2 comments
sounds like you spun a bearing. if you do nothing, it will destry the crank and possibly more.

Thanks Roy, Will have local mechanic check ASAP. Is this a major overhaul and super expensive??