Newbie needs 273 spark plug help

I have restored a lot of small block dual point distributors, about 3 years ago standard decided that small block and big block use the same points, I have sent them emails and talked to the sales people and nobody understands.
I have the part numbers so I just order the number and if the warehouse has them I get them, or maybe another store might have them, I know they are going extinct and I'm not sure we can fix it.