Wrestler Kevin Von Erich Loves Zac Efron's Depiction Of Him In New Fi

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Zac Efron is blowing people away with his transformation in the upcoming film, "The Iron Claw" ... and he's got a seal of approval from a very important person -- Kevin Von Erich, the wrestling legend Zac's portraying.

Kevin tells TMZ ... not only does Zac's depiction get a big thumbs up ... it sounds like his daughters are on board with the casting choice, too.

As for Zac's physique, Kevin says that's no easy task to pull off -- telling us it was pretty time-consuming to stay in shape like that back in his prime ... giving props to the actor for lookin' that good.

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