spark plugs

What do you guys run for spark plugs on 452 heads? Heads are off a motor home, now 440 6 pack.

Are they the tapered seat of gasket type seat heads?
How much compression and type of fuel do you want to run ?

I think its 10 1/2 to 1, 30 over flat tops so that I could run regular gas. I know it uses the small 5/6 tapered plug. I am not sure what the heat range of the plugs should be. A RV17YC came out of it but I dont know if that is the correct plug or not.

How did they look?

I won't run more than 10.0 to 1 compression ratio for todays pump gas with iron heads, I prefer less in fact

Maybe it is 10 to 1, I will ask the machine shop. Let me add that Im running electronic ignition so it should have more spark. Biggest problem might be the gap may need to go to 40 or even 45.

NGK's XR5... per general consensous they seems to be the best all around spark plug for BB.