I've had several '60-'66 Chevrolet LCF (Low Cab Forward) Trucks. Had a '60 L80 roadtractor, '64 L60 equipment hauler, '65 L60 oil tanker, & a '65 L80 Holmes Wrecker, that was full air brakes, with a 409, & Factory power steering. See them here, http://www.classiccoe.com/oldcoetrucks/6066.htm Yours looks nice. Is it a L60, or L80 ? Is it air, over hydraulic, or full air brakes. Check the air compressor governor, at the air compressor.

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery