Need top end advice

OK , I'm sure this topic has been done to death but I really need a direction to go in. I'm building a 408 stroker from a .030 over 360. looking at 11:5 - 1 compression , pretty good size hydraulic roller cam. I'm looking for 500-550 hp if possible, It's going in a 3200 lbs 67 dart with a 4 speed and a dana that has 4.56s but soon will change that to 3.73 or around there seeing this motor won't spin as high as my current 340. The car is street driven , not daily but car shows , cruising around etc. occasionally drag strip but not often.

The top end is what I'm confused about. I planned on using my current heads , intake and Carb that's on my 340. Edelbrock performer aluminum heads that I would plan on having ported big time to create as much flow as possible , the Victor intake which i plan on having ported as well and my 750 Brawler carb. I was contemplating going with the W2 economy heads and intake for my top end. Can I get some feedback on how much of a power difference it would make , if its worth the extra money , parts availability headers etc. Again , I plan on paying for porting on my heads and intake but before I do that I want to see my options.

Thanks in advance.