There was a Revell kit of a Mercury Cougar from that era, I can't remember the exact year model. I somehow wound up with a partial of this kit and I used interior parts and suspension on something. I have the engine from that kit. The parts I still have are both engine halves that include a manual gear box, oil pan, the heads and valve covers, the front water pump, two parts representing the drive belts and pullies, and what looks like a small oil cooler. The intake manifold and whatever injection or carb may have been there is gone. This is done in black plastic as the entire kit was in black plastic. Does this sound like what you're looking for?