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From what I have heard you need to pull the front cover (timing chain) off and look for a 10 or 20 in the casting. The 20 being the preferred higher % nickle alloy. My 3970010 350 block is a 10 and I'm sure it'll wear just fine as most blocks of that era were 10's.
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
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