I have done a few engines with hydraulic rollers but never owned one myself. Friend has a pontiac bracket car, lifters will bleed down or collapse completely. He is interested in running solids on it. I feel it will be fine, set at 0.005" lash cold. Is there any reason to change the valve springs to something stiffer? Car is geared to cross the stripe at about 6,000 to 6,100. Runs great when the lifters hold up. Not looking for more performance, just more reliability.