Hi Brian. You are not alone with your earlier A7 Longstroke...I am currently plucking up the courage to reassemble a basket case engine. This has several missing parts, so if yours is complete, you are in with a better chance. The early and late engines are similar design, with common problems, particularly as regards lubrication, so lots on the forum can be applied to your bike.
Welcome, keep us posted with your progress.
Swarfy.