Consider another option - use the 327/350 cam. It would help reduce the dynamic compression and it still will idle like an original engine. This cam will like the higher compression without pinging. I run one in my 350 Corvette and it is VERY easy to live with pump gas and 10.4/1 compression. I have very thin steel shim head gaskets and factory forged flat tops with 64CC iron heads. No issues at all. Just a closed hood cruiser.
-Mark.