Join Date: Aug 1998
Location: Waldorf Md. USA
If your intake manifold has an exhaust passage that crosses over right under the front part of the carburetor, then it should have the thin metal spacer. I cannot remember for sure which way the 73's are. If the manifold has been replaced, it is probably ok with the thick gasket. If it has been running that way for a long time, then put it back the same way.
Hope this helps,
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73