My pref is a stock 70's electronic dist with an HEI module mounted underneath ( www.designed2drive.com has a nice mounting bracket but it is pricey & you can easily make it yourself). An E coil/no ballast then dial in the dist subsystems in order/check rotor phasing/reduce lower axial play to .005/reduce lower tang/intergear clearance to near zero/reduce rotor tip to cap terminal clearance to .015". Many choices out there to choose from.