What is happening to the points ? ---perhaps there are external forces at work also---could the dist cam be worn or rusty, have a rough surface ---it should be a smooth polished surface, almost mirror like.
Personally I think the reason most people get the "modern" points ---that they can get them anywhere is a self fulfilling prophecy, I go the other way, am still using the points that came with the car, had problems with the old condensers, then I got the A&L one, 40 years on the points,25 years on the condenser--so far.
If the rubbing surface on the dist cam is damaged no points will last, if you are burning up the contacts perhaps the voltage of the coil is wrong or it needs a resistor
Are you lubricating the cam?