Judging by what he says in the ad, it is from a 1968 B-body with a 4-speed and 375 horsepower. The #16 head numbers coincide with the block and are 72 CC chamber heads, so they may have come with the engine. If it runs good, I would consider buying it. As always, try to get it for less than they ask for. It may sound good, but you never know what has been done to the engine until you take it apart and inspect everything. Good luck with it! Also, 428s are different than the 400 and smaller cubed blocks. It is one of Pontiac's large journal engines (400 and lower has 3.00" mains and 421 and higher engines have 3.25" mains). Otherwise, they are pretty much the same, unless it is an HO block (I don't believe it is by the numbers).
