Retrofit Hydraulic Roller Lifters 340

Yes it can be an issue.

340SFastback had that issue

Brian at Indio Motor Machine, member OU812, ground him a cam with a reduced base circle to cure the issue.

Correct, the cam Brian ground has a smaller base circle which allows the lifters to ride lower in the bores so the oil band does not pop up out of the lifter bore. Brian can set you up with the lifters and other components too.