May be The replacement motor was on auto trans and has not the pilot bushing .
In this case the input shaft and clutch are not centered . For test When it vibre .. slipp lightly the clutch and you will remark an different .
May be to late . I just view this message today. I has installed an TRW TP 141 in my duster 340 1970 . Little problem at the beginning . This cam need solid lifters I trying with hydro lifter and the higter revolution jacked lifters .
Finally i installed old lifter solid from a...