This spring calculator may help, I am 195 lbs with camelback and I got the 700lb spring and with no preload to 1/2 a turn,the sag was 27 to 30% to be honest I think the 650lb spring would be better for me with a little more bottom out setting.(on a Six Pack)
You come out at an 700Lb spring.
That fella will be devil to fit (you will need a spring compressor or lot's of BIG zip ties and a vice)
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