Found a great article at the Chicago Land MG club web site on how to line ream throttle shaft bushings. The article is by Anne & Jake Snyder and provides all the details. I did the job this past weekend in about an hour and cost me $15 including the shipping cost for the reamer. Bought all the stuff from McMaster Carr. The key is the shank OD on the reamer is the same as the bearing ID. This keep everything in line as you ream out the old bushings. I used my variable speed hand drill to speed up the process and then lapped the new throttle shafts to match the new installed bushings. I did coat the outside of the bushings with high strength thread lock prior to installing. I used the 3/4" bushings and trimmed the inside bushing flush to the carb body. Also used JB Weld to attach the nut to the front of the reamer as my driver. I've attached some pixs on the set up, but the article details the process. The good news is after the rebuild, the car started up on the 1st try, just need to dial em' in today.