Reply to "Erica needs to get hosed....."

If by the "foam seal kit" you mean the two 4" square foam rings that go between the backside of the dash and the heater box outlets to seal hot or cold air coming out, I made mine from 1" thick foam. There are lots of places that sell foam sheets; get foam that is rot-resistant or you may be doing this again, when you're even less flexible than you are now! Cut foam more-or-less to size with scissors &/or an electric turkey-trimmer knife. Try not to be too critical of the outrageously poor fit between the heater box outlets & the dash face holes; misalignments of around 1" are common but not easily corrected.

You're right- the '71-'72 dash & console is quite different than the later ones; your '74 has a fresh air valve, a flexible supply hose & valving that's missing on earlier cars. That's all the stuff behind the glove box; early-car owners have nothing behind the glove box but also no fresh air source, except for VERY early cars that DID have a different type of fresh air source. Welcome to Italian Engineering!

The late steel heater core/evaporator box is also very different, as are the two paper defroster flex hoses. Maybe you should document the differences w/photos & send it to me as a Tech Newsletter article, as a public service?

The only problem I had on early dash R & Rs was inserting the two illuminated rocker switches; the switches go in from the front but the bulb & socket clips-on the switch body and will not fit thru the dash hole. So they must be clipped on after the switch is in place. Which even for long arms & fingers, is near-impossible, at least the first time around (maybe the 4th, too).

Interesting note: the washer switch is powered from the wiper switch via a spade-lug & a short wire. There are three choices of lug on the wiper switch to choose from and two will not work correctly. This is not shown on the schematic. Good luck.