340 8 bolt crank info wanted

Thanks Gzig5! I'm not so interested in the exact stroke but I wanted to know if this crank is for internal balanced motors. Since it is an 8 bolt crank for a 340 and I was told it was an old Mopar Performance crank I believe it was for internal balanced engines. Just wanted to know as much as I could before I start taking things apart! If it isn't the pressure plate then I guess I'll be getting a much closer look at the crank.....