… Do the Casting # support my assumptions … 1972 Ford De Tomaso Pantera #2636 … Original Cylinder Heads 4* DA D1ZE 4V …. Original Engine Block D2AE-CA 2A31 … Non OE , Intake D0AE-9425-L Square bore ( 1970 ?) … Non OE Carb Holley Square bore Double pumper List- 4777-2 … All seem correct??
2A31 = January 31, 1972 block's casting date.
9J2 = September 2, 1969 manifold's casting date.
The 1972 Q code was rated 266 net SAE horsepower by Ford. The carb swap was worth at least 75 horsepower; i.e. 341 net SAE horsepower. Add 20 horsepower to those numbers for the Pantera installation to account for the lack of a power steering pump and for the De Tomaso exhaust; i.e. 286 → 361.