Hei Distributor…which post is #1?

Installing an Hei distributor on the 318 in my Belvedere. Have searched and can’t really find what I am looking for. Motor is at TDC and when I drop the distributor in, it points at cylinder #7

HEI Distributors - Fact Or Fiction

HEI Distributor Wiring

is there a HEI male post type distributor cap for the Mallory distributor?

GM HEI Distributor w/Red Cap

in Distributors.

A-Team Performance HEI Distributor 65K Volt Coil Compatible With Cadillac 472/500 V8 One Wire Installation Black Cap

Mopar / HEI distributor. Dodge RamCharger Central

Can I just replace this distributor setup with a HEI one? Goodwrench 350 : r/MechanicAdvice

The HEI Distributor: Clearing The Confusion And Debunking Myths

1997 Mercruiser 5.7 HEI Distributor Conversion - The Hull Truth - Boating and Fishing Forum

Ray's Chevy Restoration Site -- HEI Conversion

Distributor and timing on my 383

PART NO. 8200: Tune Up Kit For GM Hei V8 Distributors, PDF, Distributor

How to Set Initial Timing

HEI Distributor Installation for V-8s

1975-1991 Chevrolet Corvette HEI Distributor Cap & Rotor Kit

Proform HEI Ignition Module, High-Performance, Fits GM

Performance World 6010 EFI HEI Distributor. Fits 1987-1995 GM

Proform HEI Ignition Module, High-Performance, Fits GM Applications 73 to 89 66944C

NEW HEI Distributor for IH 152, 196, 266, 304, 345, 392 V8 Engine - IH Parts America