Bunch of Noob question from a Dutchman

Ok took the valve covers and timing cover off today. Found out I have got 346 heads on my 440. So does that mean it already has hardened valve seats so I can drive on 95 pump gas and also lpg ?

And I also found out I got a one bolt cam. So now can order the right cam kit for my engine. Think that it is going to be a Comp Cam.

Been to Gooze Garage here in the Netherlands, they are specialised in American Muscle and they are getting me a quote for the cost of new pistons and bearings in my 440.

But now I`m still looking for the original Mopar pistons to get to 10:1 compression. Anyone can help me get a part number of store where I can buy them from ??

gr Arnoud
gr Arnoud