Re: ?year #s 5797770
It should be a 4 cylinder engine, Because even the parts Description show a QTY of (4) for the ignition under your engine serial number.
part# (QTY) Description
99215A25 (4) LEAD ASSEMBLY, SPARK - PLUG Wire
63709A 1 (4) PROTECTOR ASSEMBLY - wire end
2854 (4) BOOT, IGNITION COIL - Wire end
97182 (4) SPARK PLUG (NGK #BUHW-2) BELGIUM AND CANADA USE ?33-75739! SPARK PLUG
MERCURY - (50 H.P. (1980))
Serial No: 05797770 Model No: 1050520
1980 MERCURY 50 EL