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In a SBF, the difference between a flat tappet and a roller cam is just a few hundred bucks. It's well worth it to dodge any break-in issues.
My criteria for choosing which cam is pretty simple:
If you plan to stay under 6000-6200, then a hydraulic roller will fit the bill quite nicely.
If you plan to spin the engine up over 6500-7000, then a solid roller is easier to deal with. The caveat to the solid roller cams is that you have to run high spring pressures. The lifters take a pounding from valve lash, so they will need to be monitored in 7500-10000 mile increments.
For most street engines, the hydraulic roller is the way to go. No break-in, no worries, no maintenance.
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