2843875 head casting# on 318 head

Back again.
The motor I bought has been rebuilt and the heads have been worked and I want to go to the 302 heads but the ID# is to have to pull the head? I got the casting # off of the head under the valve cover. Can anyone tell me from that # if these are just stock 70's heads before I pull them and find out that it might have 302 heads already? Just saving a gasket set and time if I can. Thanks
Author: admin