This is not out of the box thinking at all by the OP but rather a result of being ignoramus.
The entire C130 fleet of PAF was used as a bomber in 1965 war. The C-130 aircraft played an important role in the 1965 war and destroyed Many Bridges as well as Indian fighter jets during the air missions as per a TV documentary aired on AirMarshal Nur Khan. Special guns were installed at the ramp of C-130 aircraft for Gilgit air mission to target the Indian aircraft too. But that was another era altogether. The rules of the game have changed.
Not repeating the obvious flaws of the Idea already explained by some posters like much needed air superiority etc as well as common sense...
There is however one particular strike role that C130s can possibly fulfil without the much needed airsuperiority requirements over eastern border areas; Carry a couple of Nuclear tipped ALCM like Babur on modified pylons and hover around KPK Baluchistan boundary to provide "additional" and much needed "second strike" capability to our strategic weapons arsenal.
We have 18 C130s (B/ C/ E and H versions). If PAF adds ALCM capabilities to half of them for additional or "multi-role" use, then it potentially gives us a good 18 ALCMs to hit back at Indias as a Second Strike option from the air when our cities and installations are already hit.
I did use the term "additional second strike" capability as the best of it is still Submarine LCM or SLCM.
Do read up on second strike capability, its unequivocall deterrence value and why its needed and more importantly, what the implication of its use means.