worn out cam preventing ignition, cam swap or engine swap

[Rivets]

You definitely are missing a digit. Take a pencil and rub it over the code number on the original engine, the missing number will magically appear.

 

[The Brain]

# on valve cover
new to me engine
Model type code

219907 0131 B1 0805212A
Orginal engine


219907 0131BL 0864307A

 

[The Brain]

the orginal engines bottom end is fine.

can I replace the compression cam & cylinder head w/ improved valve train and keep as a spare engine.

replacment engine is strong second mow in week or less. then I'll know if I have a decent engine. I'm thinking of using amsoil 30weight oil. what do you guys use?