Opinion from some of you long time Mopar racers

I agree with roccodart. Get it on scales ASAP and then on a wheel dyno.

Then you'll have some numbers to work with. You are now (according to your numbers) 384 CID. To get 600 HP is only 1.56 HP/CID which isn't really hard to do.

You have some damn good equipment. I LOVE Norris rockers. Looks like you have a good header on it. Ignition is quality. Carb may be small...well it is. It needs a Dominator but that's not killing you. Intake manifold probably has been ported if the hands have much work on them.

The only thing I really don't like is the rear shocks. You need something double adjustable because single adjustable is useless at the level you want to run.

I think when you get it on the dyno you may be surprised to find it needs to be shifted at 7500. You didn't post your at .050 duration but I'd suspect that cam is at least 275 degrees.

Just spitballing here. Great car.