Trying some 596 head porting with 2.02 valves

Not going to be anything to extravagant. I have a 507/510 lift cam. Was hoping to get about 250 out of the intake. theoretically shouldn’t be to far off, I don’t know, the j heads with 2.02 valves flowed 220 stock and upto 275 ported, from what I found. The 596 are supposedly a j head casting with the smog stuff added, flowing 199 with 1.88 valves. Just going off what I researched. I’m sure some one around here would know more