360 Magnum building on an existing bottom end

Finally pulled the heads off my 360 magnum and the cylinders don't look to bad. No ridge and no scores on the walls. Need to clean the piston heads a little. The cam doesn't look terrible either, although it is going to be replaced. The roller lifters look really clean and in good shape also, but I'm wondering if they will hold up under a high lift cam. (.530+) Like I said before I would like to use the short block as is and put a new cam and heads on it. what do you guru's think?

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