This is a 427 ci small block. The exhaust smell is terrible. It smelled the same with my old 350 block. 3 different carburetors, new short block (Dart) used same heads (Trickflow) and intake (Edlebrock Air gap) and it smells the same.

Have had the car dyno'd and exhaust analyzed which came out right on at idle and high speed. The car idles perfect with no surging. It does not smell rich as in burning your eyes but smells musty and strong enough to take out a large area. I'm embarrassed to take it anywhere. I suspect something with the heads or intake. Any ideas?

56 Chevy Nomad
427 small block
Trickflow heads 62cc chambers (195 runners)
E. B. Air gap maniflold
KB pistons...forged, dished 10.2 - 1 compression.
Comp Thumper cam: @.050 .227 and 241 dur. @ 106 lob sep.
Holley 9380 (850 cfm) carb. prior carbs...650 and 750 cfm all 4150s. (all smelled)
MSD ignition. 34 deg. total, 12 deg initial timing.
With ported vacuum advance.