Lets talk Roller Cam Lifters.

Krooser said
Bushing the lifter bores negates the chance you will expose the oil band on the lifter and lose oil pressure. Plus bushes correct lifter bore locations and fix worn out bores that leak oil and kill oil pressure.

But is an expense that many seem to try and avoid. I'd trust bushes more, but a roller block also has taller lifter bores to begin with.

As usual, it's all combo dependent and there's no way to tell if it's all going to work together until it's been assembled.