I had a great experience with these guys. I took in my 4.7L Dodge shortblock that had well over 200,000 miles in which I overheated and needed an overhaul. They decked the block and replaced...
Five Star Engine Exchange
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Five Star Engine Exchange, located in Glendale, AZ, has been a trusted provider of professionally-built high-performance and replacement engines since 1990. With a team boasting over 200 years of combined experience, they offer custom-built crate engines designed to meet the needs of automotive enthusiasts and everyday drivers alike.
The company prides itself on remanufacturing engines in a state-of-the-art machine shop, ensuring quality and performance at unbeatable prices. Five Star provides an impressive warranty on its replacement engines, allowing car owners to rejuvenate their vehicles without the burden of a new car payment.
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Reviews

My 'newly-built' 454 BBC failed 3 weeks after break-in. Oil/filter change @ 500 mi., then again @ 2,000mi. Exploded @ 3,000 mi. on HWY @ 65 MPH, 2,200 RPM, 50 PSI oil, 170 DEGREE coolant, after...
I purchased a 383 engine from five star engines. It had tons of problems. I was told by my mechanic who has been rebuilding engines for over 30 years, that it was not a 383. It leaked, wrong...

It's apparent Five Star Engine Exchange has some serious issues based on all the written complaints, and them (Owner Chris Smith) not making things right. That being said, these YELP Reviews...

Spent $3600 having a 429 engine built for my Mustang. Drove it 30 miles has a loud knock. Their warranty is useless. You'd have to pay another company to remove the motor, deliver it to them, and...