Driveline vibration on 64 cuda

Having issues with a vibration in the driveline. 273 cubic inch 4 speed. Possible issues with drive shaft? Any suggestions?Just bought the car about 3 weeks ago drive shaft was off the guy towed it back to north Dakota from Colorado on a car Dolly put a rear joint in it to get it moveable rubber boot was shot found one at inland truck parts were they rebuild driveshaft so I took it all apart pressed out the pin cleaned everything up and regreased it all put all the parts back that we took out centered the pin and put back on the car vibrates in 1st and 2 nd when accelerating3 rd not bad at higher speeds 4 th can do 75 80 mph .whole car shakes after take off the car has 202,000 miles on it same owner for 43 yrs sitting in farm yard last 27 yrs got it home put some lube in cylinders put new points and plugs in it poured gas in carb cranked over twice and fired right up happy as a pig in in _ _ _ _ will try to send photos this forums and chat stuff new to me kinda ol fashioned oh by the way I did rotate the shaft 180 on the trans end seem to help a little also found out my shaft was missing those wave washer someone said that might be the problem ?