Where are the best anchor points to attach a 69 coupe to a rottisserie? Is there any flexing issues?

I connected mine to the front sub-frame mounts and the rear leaf spring mounts. no flex at all but it was a hardtop.

Mine are also mounted to the frame at the shaackle mounting point if you go to this thread there are pics.http://www.camaros.net/forums/showthread.php?t=157192

Great! do you have any pics of the front hook up?

http://i156.photobucket.com/albums/t32/z10kl/7272/DSC00175.jpg
http://i156.photobucket.com/albums/t32/z10kl/7272/DSC00184.jpg

Mine mounted on the front subframe mounts and rear bumper holes.

I like haviing a bar connect the front before its connected to the rottiserrie.