360 Balance Question

I will be sure to check the pinion angles and all after I get the driveshaft fixed. There is only ONE place that does driveshafts locally, and I have not heard good things about them from other mopar owners. Are there any good custom driveshaft places that I can order one from maybe? My driveshaft came out of a 74 b-body car, and was re-sized to fit. Should I just keep this one and take my chances? I can post pics of the driveshaft if needed (it looks like its two different diameters/sizes fit together). BTW my new mounts arrived, the old ones look even more worn out after looking at the new ones. The rubber isolators are almost completely gone on the old mounts!
Thank You