battery and engine ground?

340 mopar, explain please, I have had my negative battery lead grounded to the frame for the past year since my battery was in the trunk. I just moved it up front. I have a large ground strap from the engine to frame and was going to run the negative terminal to the same place. If the engine is grounded and the negative goes to the frame isn't that the same? Everything is tied together? Is there somewhere else it's supposed to go? I am talking about the only, and large negative cable coming off the battery. I don't have any small wires coming off negative cable. Thanks for the replies.