440 bottom end strenght tips and oiling

Track day Road Race application
Building my 500 ci 440 for around 700hp at the crank
I have read the blocks crack and have difficulty over 600hp
Any suggestions on building a strong bottom end , block fill ect...??

700 hp for road racing will be tough for a stock big block to handle. A stock block will handle 700 hp for drag racing but road racing puts more stress on things. You'll probably need to work with an experienced road race engine builder on a project like that. Good luck and bring plenty of cash.....