Post your 12 second small block combos

1972 340 duster w/ 4 speed trans, stk comp ratio, 1.88/1.60 valves, stk intake & T.Q., 3 angle stk heads, 1 7/8 headers, 5.13 , 29.5 tires, hyd cam, l.t. rings, 11.75 @ 113 , 3450 wgt. no nos!!!

WOW! good job.

What is;

l.t. rings & what cam?