leave the 3.55s.
They are even nearly the right gears to try the qtr;trapping at the top of second.
So leave the 3.55s, and put a little stall into it instead
And if you are stuck with a stock TC, your engine will fall on it's face while the chebby motors on by you.So if your 5.9 wants to be shifted at 5500/51mph then it will drop to 3260ish into second. So she better be making some torque down there, to climb outta that hole. Or you can put a bigger TC behind it, and fake it.
So the point I'm trying to make is this; try them and see.