The HI PERF PASS means nothing, all big blocks have that cast into them. The casting numbers are correct for a 71 402 but could be from a different year as well, they're not unique to 71. The casting dates will tell if it's a 71, if that is important. The head casting date is under the valve cover. Engine casting date on the back of the block, near the casting number. The suffix code Ray mentioned would tell you a lot. Problem is the engine is now 40 years old, what cam is in it now and what other changes may have been made is hard to say.
The distributor, starter, power steering pump, alternator can all be used but you'll need new brackets. The only pulleys you might need are fan and crank pulley. I believe the fan and pulley from the 350 will swap as well so that leaves the crank pulley if there isn't one on the engine.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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