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What is stock wheel bolt pattern and offset?

hey guys, pulling apart a motor that was in a parts car i had. it had a "built tep head" i was told, however it seems it was just a regular njv head, not even a valve job. found a few interesting things inside the engine. p/o said it got a rod knock and shut it off immediately. however we know how that goes, its never true lol rod 4 is destroyed. all the bearings are shot, oil pump almost seized up from bearing material mashing into the pump bearing surface   anywho, trying to identify the pisto

Need a new idler pully... found (1) listed on Rockauto... why is it smooth/solid, not a pulley w/ groove for belt? Am I missing something here? Thanx!