Which Carb/Intake Combo?

Ede and 600 would work well. Watch the metering on that 600, sometimes they are whacked out. The 3310 would likely be better right away from an overall metering standpoint.
I hear ya Rob. I put tested the 600 on my 340 w/ AFR gauge, a few months ago. It seemed pretty close- a little lean on off idle transition and high speed cruise out of the box, but I got it close with some minor tweaking. I haven't tested the 750 though. It was just a parts carb that I was able to put together with some extra parts in case we want to use it.

The iron is probably a spreadbore

Yes it is. Stock '79 spreadbore pick-up manifold. I do have the adapter plate though. It's a mess and would require a ton of elbow grease. Want it?? LOL