I have a 69 Cutlass S convertible.

I had the original 350 V8 engine rebuilt. It has an Edelbrock 4BBL intake on it now. Holley 650 4BBL carb.

Will any temperature sending unit fit or does it have to be one that's special to Edelbrock?

 

Far as I know Edelbrocks are drilled and tapped to use any factory-style temp sender.

 

The temp sender needs to be compatible with the system installed. If you're using a stock gauge or light, get the stock sender for a stock gauge or light.