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Engine knock on 1990 Mercury Cougar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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
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(2) Comments
sounds like you spun a bearing. if you do nothing, it will destry the crank and possibly more.

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