I don't know the max an ls rod can handle. If you wanted to use your stock rods the least I'd do is:
shotpeen the rods $40
arp rod bolts $50
resize rods (needed when installing new rod bolts) $40
that is $130 right there and then compare that to about $350 for a set of Eagle rods that can easily handle 15psi.
The choice is yours.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.