Ported LD4B :(

How far up the runner did they grind? First 1" or so? Weld up the LD4B ports and then match that to the gasket. Also take the opportunity to line up the centerlines of the heads to the centerline of the intake ports.

Is that divider cut down as well? That might help on the larger engine at high rpm. Effect on your engine, hard to know.

Keep in mind the old Hot Rod test of a 340 where the LDB4 appears to hurt WOT performance below 3000 rpm.
"Appears" is key here. I don't know enough about the engine dyno and test method to know if torque and hp under 3500 rpm are truly comparible.
Edelbrock LD4B