MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads Includes key switch with key

Includes key switch with key Mercury 30590

300-888788

Faria - Black Face / Clear Plastic 3-Hole / White & Red Text / White / Yellow Needle

so more details for compatibility will be added later for those of you that don't have access to the parts diagrams

MerCruiser Chevrolet GM 336781 BBC Cylinder Head Assembly V8 454 7.4L Oval Port Heads Includes key switch with keyPart Number(s) Included GM 336781 Cylinder Head Assembly (Tapered Spark Plug holes Large Oval Intake Ports Heat Crossover) should be similar to the 049 & 186 cylinder heads) (73 90 Mark IV 10 Bolt Timing Cover 2 Piece Rear Main Seal Flat Tappet Engine with 2 bolt or 4 bolt main blocks with 289 casting number) Compatibility Generally, the best practice is to just match your existing casting numbers. Other Information Overall good condition, visually