Different plug seats on 452 heads

[Grabbergreendream]

I am getting ready to assemble my 78 440 & noticed my heads have different spark plug seats. 1 has a tapered seat and one is flat, assuming 1 was changed at some point. They're both 452 heads. Can I get plugs to use on either or do they have to be side specific? Choices & advice appreciated.
Thanks.

 

[khryslerkid]

Spark plug Help

 

[91r/t]

Looks like you'll be buying a box of tapered seat plugs and a box of crush washer style plugs ha! No biggie just remember which side is which when ya go to change em down the road.

 

[Curiousyellow71]

Likely a head off a rv(tapered) and one off a car. There is likely also some cooling passages different between the different 452s. You will need different style plugs for each bank.