Congrats.
But be prepared for plenty of repairs as mentioned above, plus primary stuff like engine and trans.
You may get lucky with many parts but a 40year old vehicle is suspect in every way, unless someone has done a lot of work to it. But my guess is the 40kmi was put on early in life and it's sat idle for a long time since.
Before spending a dime on it Id suggest getting someone very qualified to analyze the whole rig.
You could spend more than you paid for it easily in repairs.....if you do them yourself, or much more at a mechanic shop.
Just something to consider.
If you spent $2500 on it and have to drop $5-7k in maint and repairs you may be better off going another route.