I have a 76 K15 shortbed i am doing a frame off build. Just got the cab off yesterday and getting ready to strip it down to send frame off for bead blast and powder coat. Plan is a 8 inch lift with 37s. Ive done the measurements on the truck in correlation to my garage doors. I do not want it parked outside. This is not a daily driver i have a 17 SD i drive. the question is after my measurements i have 6 inches left of wiggle room to fit in garage height wise. But i have read on here some 8 inch lifts turned into 10 because the factory springs sagged so much. how much fluff should i account for? Will the 8 inch with 37s still fit or should i go with a 6 inch? Im doing all spring lift to try and get the best ride a massive lift could get, i know still gonna drive rough. thank you!