340 lifter bores bushed or not ?? Solid Roller cam

I’m running a solid roller cam in my old 340 with the passenger side only lifter bores bushed. I’m working on a new 340 & I’m gonna use the crane ultra pro solid roller lifters.
My question is should I have the new block lifter bores bushed or will these lifters work w out ?
Also I’ve never had a oiling issue in the old block w just the passenger side done & the new machine shop wants to bush both sides, is there a need to do both sides ?