Just bought a smoke machine.

74 360 dart sport said

Exhaust manifolds leak on the bolts that rust off on the 460 gorilla motors

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You know, being a Ford truck guy (don't tell anyone here I said that!), that's what I thought as well. But the previous owner replaced the exhaust manifold gaskets (or rather, he had them replaced) about 6 months before he sold it, and all of the bolts look good and aren't rusted (this really is a clean truck).

Now I'm thinking I may have a cracked exhaust manifold....

Seeing as how I just installed my third O2 sensor in 6 months, the purchase of/investment in the smoke machine is relatively minor, comparatively speaking.