The white wire goes to the ESC(Electronic Spark Control) connection on the ECM.
The ppl/wht goes to a reference voltage, also in the ECM.
The tan/blk goes to a easily accessable male/female plug that is disconnected to check timing and then on to the ECM.
The blk/red is grounded inside the ECM.
If none of this sounds right and I suspect it doesn't, you need an earlier HEI.
Look for one with a vacuum advance on the side and a "BAT" and "TACH" connection on the cap.
