You can use any Chevy V8 distributor, so a pre-computer unit will "drop in". Performance will improve significantly, just getting the advance "curve" to work properly. We use the Petronix conversion "kit" for points-type distributors today. HEI is very good up to 6,000 RPM. Beyond that, it has its "problems", moreso in the Chevy than the Pontiac due to the "long" shaft ("deflection").
