Help Finding Engine Number on 1989 Snapper-Hi Vac

I just purchased a 1989 Snapper Hi-vac mower. I need to make some repairs because it doesn't run as well as the person who sold it to me claimed. The engine model placard is gone and I haven't been able to find it searching the web. I will include a couple of pics and if someone has the same mower I'd appreciate it to know the engine model number. I know it's a Briggs 3.5 hp.



Thank you!!!

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