The PO put possibly cheap, off-shore, wrong sized bolts, washers and nuts for spacers on the original removable frame rail.
Is your frame safe now? <- depends on how rusty it is on the inside of the non-rustproofed frame tubes, and if those bolts were ever strong enough to be used where they were used, which is unlikely considering the tubes appear to have been bent to some extent.
Did you get scammed? <- if you paid more then about 800 bucks for a non-running 1982 twin cam CB750 you certainly did.
Is your frame safe now? <- depends on how rusty it is on the inside of the non-rustproofed frame tubes, and if those bolts were ever strong enough to be used where they were used, which is unlikely considering the tubes appear to have been bent to some extent.
Did you get scammed? <- if you paid more then about 800 bucks for a non-running 1982 twin cam CB750 you certainly did.