Head Games!

OK, need some of you portmasters to weigh in on my latest developments on my 340 build. I dropped off my '72 J-heads with my machinist over the weekend. He's going to:
1) clean and evaluate them
2) give me a quote/estimate on reconditioning
A couple of noteworthy items...these heads came off my '72 340. They have had some mild port work done to them (probably comparable to a gasket-match). They do NOT have hardened seats. His quick-assessment was that the valves should probably be replaced with new, even though this motor has less than 5000 miles on it since the last build (1976). I asked him that if new valves were required, if we could upgrade to 2.02s, he said yes...but it would require a bit of blending in the bowls. Also, these were cc'd to 67 cc's during the first build to work with the TRW 12.5 1 pistons that were installed then. My new pistons are TRW 10:1 pistons. Now, I do also have a set of X-heads off a '69 340 that already have 2.02's, but mileage and condition unknown. I would prefer to keep those heads with the rest of the engine they came off of, for later use, but I do have them as "Option 1" in the event there is an issue with the J's.
Some here have said that the earlier X-heads flow better than the J's due to the port floor shape. Would this really come into play for a street motor? (planning on this being a 400HP/12 second car)
Option 2 is, of course, Edelbrock aluminum heads. If the reconditioning figures come close to the price of a set of Eddies, ($750/head) I'd likely prefer to spend the money on them rather than reconditioning either set of iron heads. The Eddy heads are complete with 2.02's, hardened seats, and high flow ports as you probably know.
I'm not planning on doing any addition port/flow work as that would undoubtedly drive the cost above the price of the Eddy heads.
Any input will be appreciated. While this machinist has a good working knowledge of SB Mopar, it's not his specialty by any means, and I'm taking everything he says with a grain of salt. Thanks in advance!