422 dyno fail

Your combo is out of wack. Heads, intake, carb, out of wack. All of it to small.

The cylinder heads being factory iron oil to so far and to say it flow 255cfm is great for a ported stock head. But against a ported Edelbrock that will go 300cfm with a larger port window is worth that 100HP easy.

The intake is super old school and will not support much more than 370 cubes and that’s seriously borderline IMO. It was made with 340 cubes in mind.

At 750 cfm, it’s small never mind being an Edelbrock. The style of carb isn’t giving up a lot of HP at this level vs a Holley but there is more power in the Holley and a good bunch of you gave it some more cfm. The air entry into the Edelbrock is what I’d call compromised. It’s fine for a street engine but not a really a great choice for a nice bruiser of a 422 that’s under it.

I don’t see an issue with the cam. I’m figuring it’s the inability to breath. If that top end package was on a 340/360, I’d bet it would be pretty OK.