Joined looking for Tucumpseh H35 info

I have an MTD shredder that I bought new several years ago.  It has been stored inside all its life.  I am trying to bring it back to life.  IF it has a condenser and points ignition, and I havent torn it apart to check yet,  I want to upgrade it.  The compression is good and the valves are working properly. No spark.   But I am having a hard time ID ing it so I can buy parts.  The engine is a Tecumpseh 3.5HP horizontal shaft, single cyl.  H35 45636S  ser 12038A.  I am sure of the numbers, checked them several times because I am told they are the wrong length.
Can anyone ID this engine?
Thank you.