Ok, here's the dilemma. The '66 I purchased had a 6 cylinder engine with engine block C6DB-6015-A (but only 3 freeze plugs) and it had the carburetor pictured below on the engine. From what I can gather this engine and carburetor are not correct for a '66 Mustang. So I find on craigslist a 1bbl carburetor out of a '66 Mustang automatic 6 cylinder (my setup). So I buy it sight unseen and low and behold, it's the exact same carburetor pictured? Coincidence? Or is this all possibly original?