You may be able to find something at a wrecking yard in the way of a box with fan that can be reworked to fit, but might alo try a place local to me called All American Classics. They remove and ship parts, and prices aren't bad. They've got tons of 2nd gens in their yard, so should have the box with fan you need.
Give them a call and they can quote you pricing.
Classic Auto ( Automotive ) Parts, Car Wrecking: Chevrolet, Pontiac, Buick, More

 

i will look into tht, and nomad, if you find it and wanna sell it i will buy it.

 

I have to junk the car this weekend so I'll take a look.

 

I have the inside heater box, core cables and such, it is for an AC car also on ebay now all the heater stuff fu=or a non AC car this is the listing 290627417700

 

all i need is the heater box and heater core, im buying the core new, but need the heater box with the fan. Im not spending 400 bucks on all this, i cang et it all for under 100

 

did u get ur heater box yet if not heres onehttp://cgi.ebay.com/ebaymotors/75-76-77-78-Firebird-Camaro-Z28-AC-Heat-Dash-Box-/360416879421?pt=Vintage_Car_Truck_Parts_Accessorie s&hash=item53ea85233d its in good shape for 85 bucks,

 

I got one for sale in the automotive parts for sale section on here.

 

atm, how much you selling for?