Roller cam / pushrods?

A question I thought would never come up

Recently fell into a roller LA 360 .030 shortblock!!! So questions................

Would like to keep adjustable 273 rockers

Am leaning towards keeping the roller lifters as opposed to flat tappets

So...................

This is a rebuilt shortblock, so probably just average 'replacement' lifters. Do we think these lifters are good enough for a cam "about like" the old 340 cam, IE shifted around 5K this is a street engine

Or should I upgrade the lifters, which is not cheap.

If so, what do I need on the lifter end for pushrod balls? I'll obviously need cups to fit the 273 rockers. Can you use the "normal" style LA pushrod ends or are the rollers different?