Let us know how you make out on removing the exhaust cover screws. There are usually a few of them that will present a challenge. Here’s a pic of a real crusty one I had a few years ago – even using the torch I had 3 break off and 1 had a boogered up head on the screw I had to drill off. Once I got the cover off, I got them all removed with the torch, penetrating oil and lots of patience. Yours look like they should be much easier to get out.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."