Seems to me, if you remove the cotter pin at the bell crank, you should be able to move that part of the throttle linkage sufficiently out of the way to grind that bolt back giving you the clearance you need.
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum