Head gasket getting oval?

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Hi guys i just cam back from the engine builder and we put all the parts from the engine out, only the block is to see now, we found damage pistons, and some other problems too, i have to bore my block now to 0,40 piston and get new gaskets and everything, expensive story, my engine builder meand that my spark plugs were to hot, he meand the heat range of the spark are too hot and maybe my ignition was too hot i had ngk bkr5es installed and he meand i need some with heat range 7 at street or 9 at 1/4 mile race, does are not the right spark plugs???

those spark plugs
http://www.hughesengines.com/Index/products.php?browse=search&search=ngk&partid=22262

came with the engine, until someone told me that they are for NOS i changed them
 
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