I honestly don’t know…how would I verify?  

An aluminum head is lighter and stays relatively shiny when cleaned up with solvent. A Cast Iron head will be dull when cleaned up, and heavier. Aluminum is softer and will scratch or dent easier. Cast Iron is harder, and will not deform as easy. 

Thanks for suggestion

Thanks!  Learned something new from you.  Will check next time under the hood!

Check your fuel pressure, the fuel pump has a tendency to fail. Also with that low mileage the tank has a tendency to collect moisture. You can YouTube either of those jobs, the fuel pressure kit is available at a reasonable price on Amazon. BTW you will enjoy your new addition. I started with a 1990 convertible with 145,000 miles then added a 1991 ZR-1. I never get tired at looking at how beautiful they are.

Hey! - THanks for your suggestions!  It's so frustrating as it happens EVERYTIME it hits about 178-180 degrees. Shut off - let it sit - fires right back up.  Will look into the fuel pump suggestions!  Enjoy your Vette!

Just use a magnet, won't stick to aluminum.

That sounds like the problem I had with my ‘93 but it is li  oh ely something else. The 93 cars have bad distributors which often need to be replaced. Just in case, has someone checked your distributor?

Check the idle control valve and clean the throttle body

Hello and thanks for your suggestion - turns out - the company I ordered a refurbished ECM did NOT program it correctly  - have been able to get it to run just fine and now doesnt stall out - however, it is still not programmed correctly!  The Service Engine Light stays on all the time!   So - time to remove the entire ECM AGAIN - hopefully this time the unit WILL be propertly reprogrammed.. soon!