340 Max HP Potential with X/J heads?

Does anyone have experience stroking a .40 over 340 with a 4.00 forged crankshaft, scat rods, 585 lift cam, Victor 340 intake, 11:1 Diamonds, worked 950 Holley, etc using ported J heads? What would be the HP limitation by using these?
Only asking because I have the chance to save over $1k by buying a pair of stock J's instead of using Eddy RPM's.
Thanks in advance.
Justin ( onewildandcrazyguy ) said he could get over 270 cfm (intake) from these heads.
If the adage is 2 horsepower potential per 1 cfm, then you are looking at over 500hp psycho camshaft potential from your 340 if the right camguy/machinist/builder god blesses your build.
Best wishes bud!
Don't die driving!