On the port work, a shop that really knows Mopar iron heads can make improvements without spending a lot of time and money. Muscle Motors has offered a good mildly worked iron head.

However if you do the math, I think you'll find that if you go beyond a basic rebuild and good valve job on stock heads the cost comes close to or exceeds new Edelbrock or 440 source Al heads.

Rebuild stock heads plus a decent cam (more cam than what you posted) sound like the best plan to get what you are after and stay on budget.