Welcome for Pennsylvania, USA. Great Find, I always liked the 150 models in a 57.
I too was like you with getting a Tri Five. I had many performance cars in my life, but not a Tri Five. I always had a love for 55, 56 and 57 Chevys, but never got one until I was 67, and have been driving and working on it for the past 3 years.
I have the 1st year of the Tri Fives, a 1955 Bel Air model.
Is your transmission a powerglide 2 speed automatic, or is it a 3 on the tree manual ??
I see you're from the beautiful country or Austria. I've been thinking of all of you people over there. Your not that far from all of the horrible thing of war going on in Ukraine, being that you are only about 500 miles (780 km) away from the border of Ukraine.
Be as safe as you can, enjoy your model 150, and at least one fellow Tri Five owner from the USA will be thinking of you in these times !!
Since you waited more then 30 years to get the car you loved, I bet there's a permanent smile on your face when you're cruising around in your 1957 Chevrolet.