What the W

cudamark said
Looks like the engine has probably been rebuilt sometime in it's life, so, likely a frankenmotor. You won't know about which crank it has without pulling the pan and taking a look at it. I've seen those W intake before too. Never saw anything special about them either. Your engine has some items that are truck specific.....engine mount brackets and passenger side exhaust manifold (318-3 manifold). There's also some sketchy looking pulley and bracket combinations for the water pump and alternator. I wouldn't attach that ground strap to the water pump either. That can cause some weird electrolysis in some cases. What are going to put this engine in? What are the head casting numbers?

The engine was bought as a spare as they are somewhat had to find. This 67 coupe barracuda originally came with a 273 2barrel (now contains a 1967 318 2 barrel that came of a Monaco.) I rigged the engine up with whatever parts were on hand it to test in my shed. The truck parts were from a 75 318 that was fitted to another car and the parts were left over . The intake was on the orginal engine I purchased. I finished testing a while ago so a parts tools etc.. needs to cleaned up like the rest of my property .