78 vs 82 FC questions

[Michael]

If you look at my pic I have several questions;

http://autos.ph.groups.yahoo.com/group/F...rowse/80b5

1) Is this plumbing for the heater take offs stock? Wouldn't brass be
better here? I'm worried I won't be able to work on these due to the
corrosion.

2) Anyone know the difference in the tach sending units between a 78 &
82?

3) The 82 has a 6-bladed fan with no clutch and the 78 has a 5-bladed
fan with a clutch. Which is better?

Thanx, Trying to improve a few things..

Michael
78FC35
Mesa, Az