Going to play lotto 440

Well I am doing a complete resto. First time. Just bought trunk pan and quarters and installed floor pans. Been taking to bare metal and spraying epoxy primer. All of the supplies for this has cost a good amount trying to do engine as economical as possible. Never built a motor before but I have a guy who is going to help me 70 year old man who has been rebuilding engines his whole life... just really want to get er done and be able to drive. Can update some after but don’t want to skip on things while the engine is out of car... would love to be at 500 hp. What do I need for that or how much cash is that going to take...