360, 750 Holley, .474" cam, 8" converter 1 5/8"-1 3/4" step headers, LA-X with 1.92/1.625 valve job & lite mill, as cast went 117 @ 3,540+ lbs.
But the point I'm trying to make, while the LA-X are good heads, Oldmanmopar has a set of factory 894 X-heads professionally ported by '70's Mopar guru Ed Hamburger. (Probably not max ported.) He is correct if figuring that his ported 894 X heads would likely flow about as much if not more air and not justify spending $1200 on unported LA-X heads. Both as cast - LA-X flows more. Both ported - LA-X flows more. Ported 894 X vs unported LA-X - ported 894 X is probably better and no money spent. If not better, certainly not $1200 worth.
For WIW, something around 240 for as-cast LA-X 1.92/1,625 sticks in my head but I can't find anything in print. I believe OEM 894 X heads were often shown as around very low 200s I also have an old "For 340's & 360's Only" Hamburger catalog which may have details on his ported heads but I hid it too well. In the early '80's when I switched from 2.02 X or J heads to 2.02 W-2 heads, I picked up about 3 tenths. (Minimal smoothing, if any.) But it's been too long to remember the details. As mentioned in my post #5, I picked up at least 2 tenths going from as-cast 587 to as-cast LA-X.
Can't go by flow #'s alone but the examples & estimates are good enough to show the standings and a correct decision.