Are different shocks the answer?

[stanski]

My 74 Jimmy is lowered with drop spindles and rear shackle mod. It rides on 8" wheels and thin tires with almost zero sidewalls. As one would expect the ride is effected by the condition of the road surface as there in minimal cushioning provided by the tires. My concern is when you hit a sharp bump it feels like the dash and steering wheel are going to come apart just like the front suspension bottomed out. I'm thinking the shocks may be the problem, too stiff for this application.
Any advice from anyone with the same problem and did you solve it with different shocks? What brand?