This should be your first purchase. New from Swati21, $13.78 plus 3.99 shipping....... $17.77 delivered to your front door.
https://www.amazon.com/gp/offer-list...2389189&sr=1-1
Read through this book several times, then disassemble the motor down to the bare block and begin the rebuild. Assume nothing, take everything you find at face value. If it's good for part of the rebuild, put it in one pile. If it's junk, put it in another pile. The very first thing I would buy after the book is a 12" dial caliper.
Here's an affordable unit that is obviously an offshore unit (China) judging by the price, but it's just fine as a starter tool for a young fellow to get used to measuring things in and on a motor. You can even measure block deck height with this 12" unit. My best advice is not to buy an electronic caliper. I have owned them and every time I would reach for them to use them, the batteries were dead. These
DIAL calipers are bulletproof, they work every time you need them.
12" Precision Stainless Steel Dial Caliper Shockproof Mechanical 4 Way Caliper | eBay
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I believe this was somewhere around 2015, Rick, Rosie and Johnboy
John Norton aka johnboy