What type of power needed to compete, with a 427 chebby? (Not stock 427)

Unfortunately there isn't much info there to make an opinion. Your looking for 650hp out of a 440? I would say start with a stroker. Next heads not saying you cant do it with stock heads but would be easier with a head like indy, B1 or something close to them. Cam plays a huge roll. You wont get 650hp out of a re-ring and 0 deck. Your going to need some major components to get there. Also at 650hp you might want to start thinking about the block. You start to get in that range where the stock block will need help.