I can't say how much power you'd get with that combo, but I know a lot of people on here frown on the use of stock ET7E heads even with a ton of work put into them like mine.
Mine are on the stock block with a bunch of other mods and I am very happy with the power my car is making with them. They were shaved .030, ported and polished, and had a 3 angle valve job.
With the added cubes of a 347 though, I probably wouldn't want to use that engine as a guinea pig for a set of stock heads. I'd try to find some better flowing heads myself.
And the intake - forget it. Unless you went with some expensive extrude honing you probably wouldn't get enough air flow through that thing to get the engine to run at all - LOL, jk.
If your short block is still doing fine why not get a cam, intake, TB, MAF, injectors, and maybe some long tube headers? Then you would have a pretty good setup to dump onto a Stroker block when you get one.
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