340 with big hopes

moper said
One thing to consider, with all the "ready to bolt on" heads is, they are produced quickly. ... ALL heads should be taken apart and checked by a shop that has the current machinery. The difference between a great engine, and a mediocre engine is details. This is one of them. The cost for the heads mandates the need to spend the extra $150 and make sure they are "right". At least in my mind.

So essentially you are talking about 'blueprinting' the heads to reduce/eliminate factory induced tolerance issues. I agree that is certainly a good thing to do. From your first post, it just sounded like the Edlebrock heads in specific had a inherent flaw in the valve seat area and that it must be fixed before the heads can be used.