If you going to do anything with the old cam just put it back in with the old lifters. Thats the best chance to live. I have a few cams I have used over the years and they lived. I have a 408 in my Belvedere that was a completely new build, except the cam. The old 490 mopar solid off the shelf with matched lifters, it is alive and well. VR1 was all I used to fire it well there was assy grease used on lobes at installation.