Hey Scott - you gotta post a pic or two for those of us who don't read so well.

The "heavy torque converter" is an odd statement, for sure. Do they know whether it is heavier than the original in weight and if so whether the weight is in the center of the mass or on the edges? Inertial forces vary based on that, not just because it is a few pounds heavier in general. I've not looked into what the chances are of such a thing as this being a possibility, but considering you are going from a 289 to a 331... and both HP and torque are going to be higher, you will probably not consider it slower to accelerate. Sounds like it has a 2400 RPM stall speed, or thereabouts.

My 347 is shipping on Monday, so I will soon be back on the road, but I will not have the ability for it to sit. Hope it is a 2-3 day swap.