81/82 430 CR engine numbers

I've got a good set 2086 1951 and I'd like to know if this would have been 81 or 82 430 CR? Any idea where 81 handed off to 82 in the serial numbers? Trying to plan a few builds from parts lying around.

The 82 430CR frame transition started with CN-11000. I do not think there was an engine difference. The 81 and 82 430 engine were both primary kick while 250 cases did not change until 1982 model year

Thanks guys. The frame numbers are pretty well sorted out. Unfortunately, the engine numbers in the chart don't include serial ranges. Or, maybe that's good... can put it into any year that used a 2086!