This is the Nippondenso starter that was sold by MP and I used for years with good results. There are remans, new, and Chinese copies available most places. Price and origin are a big indicator of quality.
On this picture, where the gold , long bolt holds it together..the little casting that sticks out on the end opposed to the starter gear hit the header
messed around with it for a couple hours to clearance a tube to make it fit, what a PITA !
I did the same on my street car, 469/5 speed Roadrunner
