If you're able to upload a picture of it, that can be easily confirmed. If it is an 8 3/4 it should be able to take a good amount of power without grenading. Also, if it doesn't already have one, I would advise you to invest in a sure grip differential.
Old work partner had a SC dragster with an 8 3/4 back there. Had an injected 500" BBC in front of it. They will handle a bit of HP. Dragster was built for sand drags and paddle tires and those paddles don't put any strain on anything :lol: