Hi PreludeH22a4help,
What you have is an SH engine. You will need to buy the ATTS unit, ECU, and transmission for this engine block. The regular Preludes have the half shaft and the oil filter is located on the block. The SH engine has the oil filter in a higher position because the ATTS unit needs space. It is located above the higher bolt location you have marked where the opening is. Look up pictures of the regular model engine and SH engine and you will see that the oil filter is located in different areas. Please let us know if you need any other questions. I'd like to hear that your restoration project is successful.