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Supposedly the VX or IPD cam gives a boost of about 20 HP- that's 15-20% for these engines. The effect on a turbo (B21FT or B230FT) is apparently less- Turbobricks.org has a good thorough rundown of all the different cam profiles that he could locate and the resulting power, 0-60 times, etc.
The VX/IPD cam should give the engine 136 HP vs. 115 HP for the normal US-spec engine. I don't remember what the torque peak moves to, but the cam is designed for more high-end power. Most folks use an adjustable cam gear to advance the cam timing 3-6° in order to keep some strong low-end power (this sacrifices high-end, but unless you work around the rev limiter, you can't go over 6000rpm anyway).
If the valvetrain is in good shape, it should not need a rebuild, but most higher mileage cars will at least show some wear on the valve stems or need new "hushers". These cars don't really wear out valves, springs, seats, or guides as some other cars do. IPD recommends buying a shim kit too for setting clearances with the new cam. A machine shop ought to be able to set that too- it may be cheaper than buying the whole kit and doing it yourself.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 221K, 88 744GLE- 202K, 91 244 181K, 88 244GL 145K
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