How much would you charge

Book time for R&R cam is 10 hrs
for intake/exhaust is about 4 hrs (stock), and you will have issues with the intake exhaust matching, depending on what intake manifold is used.
Then you need to add time for rusty/broken fasteners
Install non stock linkage, including kickdown.
Fuel system/lines will need modifying
Is the carb going to need work, or major tweeking
I would not quote less than $700
I would rather quote too high, and be able to deliver for less (or lose the job), then quote too low and eat it.