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Welcome to FTE. The codes for the big trucks are not easy to find. This will help, but your engine and transmission are not listed among the lighter duty trucks.Take your question(s) to the, "Older, Classic and Antique Trucks" section. There you will find your trucks year group. The experts live there. Also, try a search, top center of the screen. You will probably find your query has been answered before.
I have a '75 truck shop manual set so I'll take a stab at the rest of the plate. (Someone please correct me if I miss something)
176 = 176 inch wheelbase
A = Raven Black
F756 = F750 27,500 GVW
DA6 = Custom black trim, Bench Seat, Fire Truck / Emergency CC Steel (That's for 500-600 series, don't know if a 750 would be the same)
Q = Spicer 5652 Direct 5-speed
HH = Eaton 17221 18,500# 2-speed rear axle 7.17 / 9.77 ratios
N = 9,000# front axle with power steering
27,500 GVW
430062 = Special order code unknown to me