I need a high performance engine for a buick regal gransport where do i look?

My engine went out on a 91 buick regal gran sport i want 2 restore it with high perfromance engine.|||There are lots of hi-po crate engines out there to choose from. Just pick one that will meet your needs.|||try "Summit racing"..|||Take alook ebay, would bolt straight in, item is 190216775483, good luck.