Videorov - I'm assuming that having it on the trailer is not a viable option for your purposes.
3" nylon straps will definitely suffice (i.e. towing straps from Harbor Freight). Slow and easy, and see if you can find an experienced assistant.
Sorry to highjack your post, but I thought I would offer Tater the following:
I constructed a truss (more like an oversized sawhorse, actually) to lift my 170 off the trailer. Legs are 2"x4"x10' white pine nailed together to form an "L". Top crosspiece is constructed from 2 2"x10" yellow pine boards. Note cross-braces on top running from crosspiece to legs. I used a lot of framing braces and lag bolts to allow disassembly. It's hard to tell from the photo, but the legs on either side of the upright angle toward the crosspiece (like you would see with most sawhorses) to provide extra stability. I used heavy-duty 3" towing straps (NOT like the orange one in the photo), looped around the hull well fore and aft of the centerboard and looped through the hook on a cable hoist to lift the boat free of the trailer. Cable hoist was hooked over a 5/8" bolt passed through the 2x10 top crosspiece at a downward angle. Sorry, no photos of that. I stood in the boat while hoisting, but I am only 150 lbs, to total weight was about 750 lbs. You will definitely want a control line to prevent rotation.
I would recommend removing the centerboard before lifting the boat free of the trailer. It's about 85 lbs. I used the centerboard control line block and tackle to help in the removal and installation process (see photo). Hopefully your trailer will allow this. Otherwise, do not trust my rig or any such hoist to support the boat while you are under it.
By the way, in your basement? How are you going to get it down there?! Confused...
Photo shows the three-ladder arrangement I used to get the truss upright. It's a bit heavy.