Another upgrade; Next time you have the float bowl/bottom of the carb off, observe how the threaded boss where the drain plug goes, can prevent you from draining water and contaminated fuel out. Take a 3/32” drill and … up about 2 threads from the bottom … drill on an angle through that threaded boss into the lowest part of the float bowl. Now, pulling the plugs allows ALL of the fuel to drain out, even from that recess that was blocked by the interior threaded boss. Much easier starting and better idle.
I'm not a fan of the 6 bolt rocker box covers on these later T140's. My 64 TR6 is so much easier to deal with if I need to get to the valves... it's got the 2 round covers that screw off on each rocker box. Did you ever get the bike painted? The Triumph episodes end and we don't see the finished product.
I own a Rolls-Royce Spirit and when fitting the stay up floats its necessary to set the float height. I thought the Amals would be the same. Good luck.