To determine compatibility:
1. Identify the specific transmission: Look for casting numbers on the transmission case. This will tell you exactly what type of transmission it is (e.g., TH200-4R, Powerglide, etc.).
2. Identify the engine's bellhousing bolt pattern: This usually involves counting the bolts on the engine's bellhousing. Different transmissions have different bolt patterns. A picture of your engine's bellhousing would be helpful.
3. Consult a parts catalog or online database: Once you know the specific transmission and engine bellhousing pattern, use a resource like a Chevrolet parts catalog (many are available online) or a site like Summit Racing or Jegs to verify compatibility. These resources can cross-reference transmission types to engine blocks and their corresponding bellhousings.
Without this specific information, it's impossible to say definitively if a 200 transmission will work.