/six head work and porting

Thanks guys, 63 valiant,65 A100 pick-up. The Valiant has .060 pistons, comp cam 252. 500cfm carter AFB, offenhauser intake. I had this engine done at a reputable engine remanufacturing facility at Johnson SC a few months ago. Told them to remove .090 from the head also. After running in the engine, the Victor head gasket started to leak. Pulled the head only to find out it had not been milled, so I had it milled .090". Put back together, now pings terribly! After doing some measuring, They took .090 off the top of the block!!! So now I will have to go back to a non milled head to get my compression down. James