My take on the oiling system crossover tube for the small block

Jadaharabi said

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If the pump does not take care of the problem you could always put in solid roller lifters and see if that cures the oil problem.

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Few questions:

Wouldn't I need to bush the lifter bores to do that? Which would also require dismantling the shortblock?
If bushing is not necessary, who makes the solid roller lifters that would drop right in?
Would they work with my hydraulic roller cam? or does the cam not care if the lifters are solid or hydraulic?