I am looking for a replacement HEI for my 78 TA with W72 engine. I like both the Pertronix Flamethrower and the Performance Distributor DUI unit. The Pertronix coes with 3 advance curve sets so you can pick which curve you want which I like. The DUI model has the curve factory set based on engine/cam specs. Not sure I am comfortable with that. Anyone have experience with either of these models or other brands?