I have a 68 302 block in the 82. Some notes: They have shorter lifter bosses and need a retrofit roller lifter setup, use a two pc rear seal, and do not have a dipstick hole. I am using a 1978 302 crank with 28 oz balance, 94 heads, etc, and it works fine. I know you can machine early cranks for the later blocks, but not sure about the other way around.
You need to just make sure the rear seal setup matches your crank, and that your damper and flexplate match the crank balance. I use 80 four bolt pulleys. You can bolt the later 5.0 pulleys onto these dampers.