Newbie Dart Axle question

We are actually in Rio Rancho too. Put ABQ as most have not heard of RR.

Good to know another Moparite is in the same area.

Got the 8.25 cleaned up, gears looked at and new oil in and rebuilt the brakes on it. Now just need to get it swapped in. Only two stickers on it for me and that is I need to get a new brake hose for it (something like $35!! for it and order only at AZ, Checker etc. Need to recheck NAPA and see if they can get one). I also need to have the drive shaft shortened by what I've read here. Been checking this AM as it seems like I need to have it shortened by 1.5 inches. Just want to double check before doing the job. Car is a /6 right now with a 904 and 7.5 rear. Swapping that 8.25 in for the strength and larger bolt pattern and going to drive it on the /6 for a while. Any suggestions on a place to do the driveshaft?

Am I okay with having it shortened by 1.5 inch so I can bolt all in at once?

All going into a '71 Dart.

Thanks for any help.