Hi, Im finishing a mild '72 cast crank 340 build and want to break it in on a runstand. Whats the cheapest solution for starter connection? My cars auto so I dont really want to buy a $300 ext balance flywheel for one start up. Ive heard of cutting open and using 1/2 of a torque converter which sounds good except what about the external balance part? Seems like an off balance mess. Thank you