86pulsar

I have a 87 pulsar with a twin cam in it that i think the computer is bad(been sitting in a pool of water)

The number on it are. A big 27 then little A18-672-A20 and a little 619

what numbers matter when finding a new ecu and where can i get one?

SuperStock

go to car-part.com and look for the ECU for an 87 pulsar 1.6 twin cam. u should be able to find some wrecking yards w/ what u want. be sure to specify if your car is automatic or not, the comp might be different for those