Some things bother me...like a Chevy motor in a Ford, or vice-versa. Any NON-Chevy GM musclecar with an SBC is annoying. You can build an Olds, Pontiac, or Buick motor just as easily as a Chevy, and quite probably get better results.
I INTENSELY dislike seeing SBCs in AMC cars unless it's an Iron Duke.
Now if it's a period-style rod...a Buick nailhead or Cadillac V-8 just looks RIGHT in a Deuce. An early Hemi looks even better....