When I first started going through these recipes, I noticed the typos. We don’t see typos like this so much anymore. (although these days there is an aggressive disregard for proper spelling in casual communications but no need to go into that here.) But back when Priscilla and her mom were typing these recipes, the only way to fix a typo was to start over. According to the Internet, liquid paper wasn’t invented until 1956.
I love that this was for birthday cake. Sounds like angel food cake — the part with the eggs is confusing. Probably intends to say just egg whites.
75 minutes in the oven at two different temperatures and then an hour-long cool down. No wonder Duncan Hines was such a big hit back then.