How do I identify my Slant 6?

Thank you for the info. I really appreciate it!
Looking from the top , just above the alternator bracket, looking from the passenger side of the engine you will find the displacement stamp.

Being a 1970 you could have a 225 or a 198 cubic inch engine.

Being a 1970, yours should say "F225R" or "F198R" depending on your displacement

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