The newer blocks say either 5.0 or 5.7 back by the bellhousing. If you have it apart measure the bore. If it is 4" then its a 350. Smaller than probably 305
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70 C10 long fleet, 355/200 4r, 6 lug disc conversion, 3" drop
70 gmc changed to 67/8 chevy, 454 with voodoo cam, th400, all 74 running gear.. in progress
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