Thank you Techinspector. I was looking at these heads mostly do to the 70 cc they offer. that would put my SCR at 9:5-1 and dynamic at 7:8-1. I was going to use a .039 head gasket as my block is decked to .005 I think that will be ok for the street. I am just wondering about flow of the heads I don't know much about flow numbers. I did see the AFR heads had higher numbers and there 75cc heads would bring my SCR to 9:0-1 aprox. I am using a 270 /278 @50 219/228 519/530 cam from Lunati. Edelbrock performer manifold and a holly 650. Block is bored .030.

Thank you for all the info gives me a lot to think about before I screw something up..