68 PlymouthValiant custom interior idea

A couple more days and I'll be driving it down the road to start some work on it. I found a mechanic through one of my friend's. Her brother in-law is a mechanic and loves to work on old cars. I'll be able to take care or find out what the knock means when you take your foot off the accelerator, the noise comes back by where the drive shaft meets the differential. I think it might be the ujoints just to start with. Prayin its not the differential, i've had to replace that 3 times on my old 2000 Chevy S10 xtended cab.