I have a 63 C20. Think you already know the bad areas, but as 48bigtrucks says check the windshield brow. I've had mine now for almost 10 years. The only problem I had was the 292 cracked the block between 3 & 4, letting oil into the water. Check your 230/250 side covers, if 6" high it's a 292. I'm in the central valley if I can help let me know.

Larry

I don't own a vehicle that isn't old enough to drink.