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.

I do well with mine.
410cid
.040
10.1
Cranks 185psi on the gauge
Solid roller, mild at .575 104/108
I'm good for over 500 hp, and i very much enjoy driving it. In fact I fended off a 585 hp Audi in the rich part of Encinitas the other day. You gotta love the torque curve of a 4" small block, like light switch 500+ right now till 5500 or so then horsepower till 6800 and done 'with my dual plane still on there' lol
I havent put the ported victor on yet, just the matched LD340 that only does a measly 282 cfm 'yank yank' LOL