I just went and looked at a enigne at a local salvage yard. It was supposed to be a 350 sbc. It was like no block I have every seen before. On the back of the block it was round when the trans bolts up insteaed of the usually house shape. And the oil filter would be on the passenger side at like a 45 degree angle facing down. And it looked like the water pump had some sort of spacer between the pump and block. The guy wants $500 for it. He said it ran like a champ whenever it came out. What is it and is it worth $500. any help will be greatly appreciated.