I used a pipe and a tee. I removed the threads from the tee and polished the inside. The rectangular piece at the end I got from Home depot. It has a bevel on each side. Then I cut out the middle. I have about 2 ft left over if you need a piece.
It looks like casting flash! there should be an oval opening into the timing chain area and most blocks have casting flash there. A picture from the front will tell for sure.