There was a point in there where they went from conventional bolts to the stretch kind. I believe 79 would still be the old style bolts which I believe are reusable. The stretch bolts are necked down a bit and as noted can be measured to determine if they have enough stretch left to use safely.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.