I couldn't pass this up, Don't whoop me.

Very nice.
X frame was from 58-64 I believe. I had a 1960 Belair with a built 355 and a 4-speed with a 12 bolt rear. I sold it for a 72 Corvette in 1999.
The center carrior bearing for the driveshaft.....I tore mine to shreads a few times, but the way to make them last the longest is this.....install the driveshaft into the trans, and also to the diffy but leave the carrier bearing bolts loose in the frame. The car has to be on all 4 wheels before those 2 bolts are tightened or there will be a preload on the bearing rubber. Once the weight is back on the suspension, tighten the bolts down.
Another tip, if you need to work on the rear of the car, don't jack it up by the chassis and let the diffy hang. It puts too much stress on the bearing rubber and will shorten it's life. Instead jack by the diffy itself, OR loosten the carrier bolts again so the shaft can move with the suspension travel. The holes in the chassis for the bearing are slotted.

I loved my ol Chevy and always wanted another one, but not another 60. I like 61, 62, 63 the best, but am also partial to the64, 65 and 66 Impala's. One day I might buy another.

Best of Luck with that beautiful car, and please take more pix!!!

George