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Check out www.jasperengines.com for pricing or go to a place like Advance Auto Parts. They should be able to get you an engine with a warranty. I pulled a 300 I6 from a salvage yard and ran that for almost 100,000 miles before it died. It just matters what your willing to spend. Happy Hunting!
You can also check out fordracing.com. I bought a new short block from them for 1400. You just have to check who can order it from around Dallas. But the short block has all new parts including block, just switched the cam for a comp 31-255-5, and went with aftermarket heads. The part number for the block is M-6009-B50