So I just bought a complete drop in already removed from the truck and the owner installed a 454. I think it's a 504 block. The crazy thing is that this truck has 17k on the clock. So I only paid $150 for the complete engine, worth that in parts for sure.

So here's the story I got: it started smoking white smoke and skipping all of a sudden. There's fuel in the oil. He thought it was Injectors, replaced a few injectors and no change. Without further investigating, and literally immediately he pulled it out and installed the 454 and sold it to me.

So I've had lots of these engines, mostly ended up cracked heads and blocks when I buy them for the parts. Before I strip this one down, I wanted to get some feedback. Does this sound like it could be a bad pump, or most likely cracked heads?

Thanks in advance