| Part | Interchanges with Small block |
Interchanges with Big Block |
Notes |
| Condensor | Yes | Yes | |
| Distributor | No | No | |
| Distributor Cap | Yes | Yes | |
| Distributor Gear | Yes | Yes | |
| Fuel Pump | Yes | No | |
| Fuel Pump Mounting Plate | Yes | No | |
| Fuel Pump Push Rod | Yes | Yes | |
| Harmonic balancer | Yes | No | Small block balancer will fit but timing mark must be changed. |
| Oil Pump | Yes | No | |
| Oil Filter Cartridge | Yes | Yes | AC PF-141 (used up through 1967) |
| Oil Filter Cannister | Yes | Yes | Used thru 1967 |
| Piston Rod Bearings | No | Yes | |
| Points | Yes | Yes | |
| Rotor | Yes | Yes | |
| Rear Main Seal | No | Yes | |
| Starter | Yes | Yes | |
| Timing Cover | No | No | |
| Timing Cover Seal | Yes | No | |
| Vacuum Advance | Yes | Yes | |
| Valve Springs (340hp 409) | Yes | No | |
| Valve Springs (400hp 409) | No | No | |
| Valve Springs (425hp 409) | No | No | |
| Water Pump Bearing | Yes | No | |
| Water Pump Seal | Yes | No | |
| Water Pump Impeller | Yes | No |