[Spits] Exhaust Manifold '78

[s1500]

What I did for a Weber DGV + 2+4+1 exhaust was shave off(ie grind) a bit 
of the intake manifold(where they touch) until I was able to slip a 
piece of paper between the two. Before that, the manifold got slightly 
pushed up enough to let too much air in there and thus the car wouldn't 
idle unless I gunned the  engine. Easing up the manifolds touching each 
other resolved it just fine.