I don't know if anyone can be held to a "Flat Rate Manual" for anything that old. For those of us with experience it is a relatively straight forward job. However, there can be some be some considerations based on 50 years of grease and crud, broken or stripped bolts, and most importantly what kind of a mess did the previous repair person leave behind. If the shop person stands there and scratches his head and exclaims that he has never seen one before and he will give it a shot, take it somewhere else.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine