Hot Rods sbc id

i have a sbc with no casting numbers on the rear. it is a one piece rear main seal engine with a balanced 168 tooth flexplate. the starter bolt holes are staggered and 3/8 american mounting holes. on the pass side front of block is the number vo725urp. i am trying to figure out what starter i need.

 

Try 1990 Chevy pickup.

http://www.oreillyauto.com/site/c/detail/ULT0/033367/01920.oap?

 

thanks squirrel, i do appreciate the info.