* Bellhousing: The bolt pattern on the engine and transmission bellhousing may differ between these years. Chevy made changes to the bellhousing design throughout the 70s and 80s.
* Transmission Type: Different transmission types were offered in those years, and they might not be compatible. For example, a 1974 engine might have a TH350 transmission, while a 1986 car could have a TH700R4.
* Flywheel: The flywheel required for a 1974 engine might not match the 1986 transmission.
* Starter: Starter motor placement might also differ between these years, potentially causing conflicts.
What you can do:
1. Identify the specific engine and transmission models: Look up the engine and transmission codes on the identification tags of both components.
2. Research compatibility: Once you know the specific models, use online resources like online forums or Chevy parts catalogs to check for compatibility.
3. Consult with a mechanic: A qualified mechanic can assess the situation and recommend the necessary modifications or adapters to make them compatible.
Important Note: There are many factors that could affect compatibility, so it's best to have this information checked out by a professional. Don't assume they will work together without doing your research first.
