Swapping out a Voodoo

Hey all. I want to swap out a Lunati 704 Voo-doo for a roller. I have 273 rockers and KB 190 pistons (small domes). Looking for a straight drop in - that is I don't want to fly cut the pistons if I can avoid it. Happy with the Lunati performance just I've wiped a lobe and don't want to go through that again. What have you used with out remachining the engine? Cheers
What's the engine build ?
Starting with cutting the oil filter open ,is where I would start..