Lisa.........congratulations on grinding the old flathead. That is the result of excessive milling at the automotive machine shop. Most people would buy the later 6.5:1 8N head. Arn't timing lites amazing? The first one I had, had an orange lite in heavy rubber sleeve. The one I have now, is chrome plated and will light up the sky even in daytime.
As fer the "long pin", you only need it fer the jingle-jangle bars that hold up yer sickle-bar mower. And when you do use the "long pin", the rocker pin hassta be "hollow". Map gas is NOT HOT enuff. And VERY CAUTIOUS 'cuz you'll break the castiron "ears" that hold the short pin. ........Dell