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.