Mabey it will use stock magnum rockers or poly rockers. Mabey the valves will end up nearly straight up and down so they don't come close enough to flat top piston to need valve releifs. I am sure it will be expensive, no way around it when you can not use an existing cam, intake or headers. Mabey they can use a few stock items but a lot will need to be changed and the cost will add up. Probably end up being cheaper to just build an CNC ported eagle headed 400 inch new hemi.