If you see smoke coming from the back of the engine block, check the base of your tranny tube. Fluid leaking onto the exhaust manifold is a common cause of engine bay fires.
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While it sounds like a simple part, it is a frequent point of upgrade and failure in custom builds: tranny tube
In older vehicles, the point where the tube enters the transmission case is a notorious leak spot. Modern replacements often use high-temp Viton O-rings to ensure a "dry" driveway. If you see smoke coming from the back
Tubes like the 811A or the 3-500Z are iconic examples. These aren't your small preamp tubes; they are heavy-duty glass envelopes designed to handle thousands of volts. tranny tube