383 power?

Don't worry about the heads. Run a cam that wasn't designed 30 years ago. The MP grinds are all old technology and junk IMO. I wouldn't run another one if you gave it to me. I recommend one of the LUnati VooDoo grinds. Also, if it's power you're after, ditch the Edelbrock carb and run a Holley 750 vacuum secondary carb. I'd bet that the Holley will make 20 hp more than the Edelbrock.