well to make a long story short.....i installed mine on my 76. it was back in the day when they thought it would be a good idea to use a thermostat to control when the choke should be used. well wehn i rebuilt my carb, i attempted to replace the thermostat. unfortunately, the small sheet metal screw that attached it to the intake broke off, it was easiest for me to install the manual choke. it works good for me, once i got used to how much choke to give it. i flooded it out a time or two. the most time consuming part was getting the cable the right length and mounting the cable inside the cab. i didnt seal the firewall with anything, it is minimal compared to other cobbled jobs. i would say give yourself a good hour to install it.