New to site, new to Mopar overheating issues

They are the correct pulleys for a non A/C setup. If you go with a clutch fan and 18" fan which I recommend, use an aluminum radiator which is thicker than stock, the fan will be too close with a stock mopar fan clutch. Use a Hayden fan clutch #2765 for a 1990 Jaguar XJ6. It comes with a centering bushing and is shorter in length to fit with a thicker aluminum radiator. I agree though, first need to see if the gage is screwy or if it's really getting hot.