Factory 68-71 340 727 specs

The less springs in the high gear drum will apply the high gear clutch quicker when the car is shifted into 3rd gear. The more power the car has, combined with the higher line pressure manual valve bodies or shift kits, the more springs you will want in the high gear drum with more clutches. If you run thin steels and clutches, you should be able to get 4 clutches in the high gear drum without issue. If you don't have anywhere to machine the pressure plate like CFD244 posted above, you can purchase a new pressure plate that is thinner to run the extra clutch, or extra 2 clutches.

Agree with MoparMike1974. Don't sweat it. These are easy to do. If you followed the book, your transmission will work fine.