I had an ATK engine installed in my 1992 Caprice police package. It was a great engine, with great customer service, a great price, and a great warranty.
I've not had any experiance with their Chrysler motors. I bought my engine back in 2001. It was an L05 police-spec'd L05 350 V8, long block assembly, 3 year/75,000 mile warranty, free shipping, and a $300 core charge. In all, it cost me $2100 to buy the engine and have it installed with new water pump and hoses.
It appears on the 'net that they have changed their website around and have bought another company or something. Used to you could go right online and use the catalog to shop.
**1997 Jeep Cherokee SE**
Former Police Car assigned to 54-26, RIP.