Paul, whats TOPCOW mean?
The 380's are famous (or infamous, as the case may be) for unreliable timing chains, as they were ex-factory with single-row chains. Updates to double-roller are commonly executed. If the chain jumped at start-up, you may be OK as far as further engine damage. For cripes sake don't drive it if it runs, don't even crank it. Get it in and get it changed over, as a good dealer would have recommended a good 10 years ago, after the problem was apparent. Jumps at speed are know to cause damage, including, but not limited to, holy pistons, pretzel shaped valve stems, and ventilated valve covers and blocks.