Hey PlH, I just installed a Weber 38/38 and have the same question. On this post you asked the question about using a vacuum on both ports on the distributor advance, but I didn't find an answer to you, so could you tell me what you did with both ports? Did you swap out to a single port?

RockU - Federal Way, WA - 1989 Montero, New-2.6L, New-5spd, New Clutch, header, 10x15 wheels, 32x11.5x15 Mud Claw (Cardovan), 4" lift, Superwinch Hubs, Front LSD, Synch 38/38 Weber Carb, K&N filter, (Let's hit the trail!) Home Email: jondanderson2002@yahoo.com