I am far from an expert, but from what I understand the curve between 130 and 70 behaved pretty much the same way as it does today but the top tail was somewhat different, no idea about the bottom tail...

So, assuming my understanding is correct, 130 on the SLBM, if you were 8 when it was a current test should be similar to 130 on a current test if you are 8 now, but 145 maps to a much higher number back then, and I don't fully understand how.