Yup, that is an era correct Q-jet. Notice the divorced choke with the rod that goes down into the little metal box. Inside is a bi-metal coil that sits in a well on the exhaust crossover. As it gets hot it opens the choke. Since an electric choke won't fit that model the divorced choke is the best of that time. What I always liked about it is that residual engine heat keeps the choke where it should be so restarting is easy. Now you have to figure out if that factory replacement cab was ordered for the original 400 or the 350. Technically the carbs for each are not jetted that much differently, but any replacement carb that is specified for a 350,400, and 428 has to be a compromise. Q-jets are very tune-able. The specs and parts are available and you can re-jet and metering rod that carb to the exact specs that your engine was originally supplied with.
