Re: 69 camaro coupe rear axel leaf spring perch
As david Pozzi noted on one of your other threads, a monoleaf perch doesn't have the center hole used to properly locate the through bolt in the center of most multi-leaf springs, so you should check to see if a plate has been added or if the springs have a flat top through bolt.
Four U-bolts is fine, better than OE if they are good quality. GM used four T-bolts on low performance cars, and one U-bolt/two T-bolts on high performance 1st gens.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!