55.2-59 700R4 Source for '56 GMC?

[dcdodge]

I am in the process of planning to install a 700R4 into my ‘56 GMC 100 pickup that currently has a 455 Pontiac coupled to a TH400 followed by 3:73 gears. Have talked to some of the vendors but looking for feedback from the forum. Truck is just a cruiser with maybe 300 HP/400 lb-ft of torque fueled by a Quadrajet. Prefer to buy a good rebuilt unit from a reputable source either local or the ones advertised such as Phoenix, Performance Automatic, TCI, Monster, Transmission Depot, etc. Aware of the issues with the 700R4 and the parts needed for the install but would appreciate any information from those who have done the swap.