If you get a check engine light, just ignore it. You probably won't, though. At the very worst, you can pull the EVP sensor from the EGR valve and just let that hang (no need to keep the valve part). You'll get a code 33, but I don't think you'll get a check engine light. Since your EGR is sticking open and you don't need it, I'd just put that plate on.
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351W 89 Mustang GT Convertible