Thank you guys for all of the insight. I am about to start the engine build. I am looking for a reliability and longevity for a lot of traveling with the car. I did some more research and found that the "15" heads that I have are actually 1970 455 heads. They have already been worked and upgraded with screw in studs so I would like to run them. I am still not sure if the block will bore to .030 over yet but if it will, my machinist claimed that the silvolite pistons will help bring the compression down around 9:1. Wouldn't this make it more streetable for modern fuel? Also, If I run this combo, would the 068 or Summit 2801 cam still be the best fit? I will ditch the single plane intake and get a Performer instead. Im planning on using an EFI kit as well. Thanks again!