I'm in the process of rebuilding a pontiac 69 400 for my 69 bird, block code xh head code 62. I was going to replace all the rockers and have received a fantastic price on a new 1.65 to 1 roller rocker set. Anyone know if these will work with this engine. Or should I just go with a stock rocker. Any input on a cam I thought about the original grind for this engine or a stock ram air cam , any other suggestions on a good cam for this engine . Pistons will be bored 10 over to get rid of some scratching .I've also been told to have the new pistons milled down a bit to lower the compression to around 9:1.Is this necessary, Kind of backwards form what I use to do. Help and advice are always appreciated.