Single Outlet Header 82 Spirit?

Not sure if they make any.   What alot of people do is...get a 91-up head and factory header and put that on.

Clifford only makes a 3-1 + 3-1 shorty style header. Dual outlet, but the outlets are high enough that it's easy to make a 2-1 collector at the end. They make it that way so it will fit the widest variety of applications. Price is $359 (http://www.cliffordperformance.net/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=57-2300&Category_Code=J258).

If there is a pick-n-pull yard nearby get a 4.0L head, valve cover, and factory header. You can get everything for about the same price as the Clifford header and solve the leaky plastic valve cover problem AND get a little bit of a performance upgrade with the better flowing head. The factory headers can crack, but are easy to weld up. Use a hanger near the firewall to reduce the chance of cracking again.

I thought about the head swap but trying to keep it low budget while I put away for a 360. Would the factory carb mani fit the 4.0 head and factory header?

The 4.0L head is cheap around here. You need to grind the tabs on the intake slightly where the alignment dowels fit and line the ports up but it works well. On the Renix exhaust we had to dent the pipes where the intake was hitting but HO clears fine.