If you have access to an air chisel, you can nudge the edge of the bolt head. When renewing the bolts, use a smear of anti-seize and torque correctly. They are low torque, hence the lock tabs since they are known to loosen over time.
1980 SWII LRL-41587C FInj
1976 SS LWB LRE-23114 Harkness RR