Are they hydraulic lifters or solid? You might have had the one that wouldn't spin before a tad too tight. which will also cause it to run rough. They spin because the lifters aren't centered on the cam lobe, they're offset just a tad & that causes them to spin in their bore, unless they're too tight. Glad you got it running good again. Sometimes it's hard to get that last little chatter out of an old motor, especially if it runs solid lifters, those are a bit noisier than hydraulic lifters. We put a new cam/ lifters & timing gears in our old 140 a couple years ago & I still can't get that last little bit of chatter out. No one else hears it but I do. I think it's a wonky rocker arm or bushing but it runs good & it's just barely noticeable so I leave it be. Good job getting it running smoothly again.
