expert help needed (my first post)

i also plan on doing new wireing harness, new dadh, headligher, and seats. would it be stuiped to think i could get 30 for the car if i get it almost perfect?
So here's the catch. You're learning, as we all are, but in your case just beginning to learn about these particular cars. So it won't be perfect. For flip, the goal is to take something poor to OK and make it good or at least better in some way that makes it more desirable. For a quicker sale it needs to appeal to a broader market and more middle priced. For a higher end sale, it can be a smaller market but will sell if you are patient. But these buyers will be more discriminating and likely more knowldedgable

its all there just switching to black. no one has put a 440 stick in an abody and sold it. or alteast i cant find any. thats why im stumped on what it could sell for if i did it. here’s pics of my interior, need headliner idk about dash. need everything black so doors and seats and ext.
The factory did, and it took a lot of work. For '67 the 383 was the only BB offering. Not big sellers even then. But it gave them bragging rights and related marketing.

I'd agree for the interior to match the paint job. Some is good, some not great. IMO Instrument panel needs to be replated and detailed for a sale at the prices you're targetting. Little stuff in there is a major PIA. Defroster ducts and hoses for example. Heater cores and heater box rebuild is another. Wait till you find out that the replacement heater cores don't fit. Hopefully you have the old one to get recored. Stuff like that.

everything that has a 440 looks to be for 40k+ would have to get a new hood or would a 440 be fine. thanks to everyone thats here helping me.
Hood is not needed for fit. The hood you see in that ad (if its the same as I'm looking at) is for a '68 Hemi (NHRA SS-A and AA ).

My suggestion is use this experience to learn, and be open to that. There may be some buyers who may be interested in your project but don't count on it. Do it for yourself. Take a look at the factory package and consider that a baseline. By package I mean everything from exhaust and steering arrangments to leaf springs and diff.

If you have to do electrical, again, execution will be critical both for appearence and for performance.