Hello and Questions

Hello all, they call me Biggy and new to the board. I drove from West Texas to Las Vegas and picked up my 1971 last weekend in two days (1900 miles). I\\'m getting too old for that. Anyway I want to restore and make a street rod out of her. It has the orginal 351C with a broken timing chain. I am pulling it and will rebuild later. I am going to put a crate engine in it. I want serious punch but daily driveable. Any suggestions? I am thinking 450-500 hp. Also, when I change the engine how can I order the correct headers?

Thanks,

Biggy