forgot to mention that my 418 is set up for 10:1 comp. cause they were building it for the street and wanted to run pump gas. I have a new set of aluminum heads w/220 runners that are CNC ported from some shop that builds race engines, dont know who's blanks they used but they still need to be fitted with valves&springs and such. I will get more info on the heads when I can, looking for some suggestions on valve size, roller cam, intake carb. I do realize ya may need actual head specs and I will get them when I can. When I can figure out how to upload pics here, I will do so as I would like to share this build with you guys who can help me build this motor. May also look at spraying the motor as well but would like to get the most out of the motor.