72 350 chevy

Hello i just wanted to ask some questions i just bought a 1972 chevy and has a 350 in it and im wondering if it is a orginial 72. but how much hp did the 72's have? and the 350 is under a 3/4ton truck and have 39 inch tires and it seems like it doesnt even want to take off i know it doesnt have positive traction in the rear and if i floor it on take off it wont even spin is that a sign of bad engine b/c i know what a 350 can do. ty please send me inf

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