Just so you have the right expectations, that Starrett 98-6 isn’t precise enough to align your lathe bed ways. It resolves to 0.005” per foot which is fine to grossly level your lathe, but not accurate enough to align the bed. Mark's SPI and my Starrett resolve to ten times that resolution. There are other methods of aligning the bed that don’t require a level. I suggest you watch
this video, and
this video or search on "two collar method lathe leveling" for additional information. To precisely align the headstock, you'd need a test bar
like this one. I have one I can lend you if you cover postage - DM me. Some people use
this gizmo to align the tailstock, but the 2-collar method works also.