I bet you can find a used set. They are so heavy, I am sure others who bought them then upgraded to aluminum later. DAMHIK.
if you do find a set, and need 2.25 intake valves, let me know. I will let go of the seven valves I have for half of retail. Very low use, maybe 250 runs, one valve job on them.

8..603 156 mph best, 2905 lbs 549, indy 572-13, alky