1969 Chevelle

Hey, i just registered at this forum because I'm looking for some help. My Dad bought me a 1969 chevelle with no motor and a turbo tranny...the inside is totally ripped out except the dash/steering wheel. I have the original glass and lights. Im currently attempting to take the body off of the frame...it has 8 bolts going from frame to body but the screws spin when i try to take them off. My dad has heard that there is a kit you can use to drill through the body(inside, under carpet which isn't there) and get to them when you try to put the body back on. I've got the front end off. Any help ?