Climbing aboard my hobby horse, when you have the lathe in place, adjust the level from front to back at Headstock and tailstock ends to eliminate any twist in the bed.
Either use a sensitive level, or use the Myford method, (spelled out in Pages 27 and 28 of The Amateurs Workshop by Ian BrdleyL and similar books ) If the bed is twisted, long work is likely to be tapered.
Time spent in positioning and setting up the lathe will be amply repaid in the future.
ENJOY!
Howard