I wouldn’t worry
your getting a much later built engine, buy the extended warranty before it’s registered, i.e. Get it on the sales invoice.
run it in and enjoy it… if any thing happens in 5 years Ford will fix it.
My dealer who sees a lot of Mk3’s, reckon least one a day, has only had one engine to replace, that may have been for other issues.
We are only more aware because it’s a fan boy car with forums, normal cars have issue but don’t get the attention.
Magnetic Grey with all the best bits
FPM375/COBB/MSD- Quaife LSD, DSC+Tractive Suspension, HJS200 cell sports cat and MT Cooler. Sync3 upgrade.
Was UK seller for DSC & Tractive Active suspension !!!