Those two 600's are WORTHLESS. You can use 2 650's and be way better off.
The number one killer of TR engines is over cramming them. Number two us under carb'ing them.
Get on the phone with a true carb guy, like Thumpr carbs in FB or Mark Whitener or BLP or Braswell and let them fix you up with two good carbs.
The 1850 Holley was garbage when it was drawn up, unless it's some dead stock deal. And then it's useable.
