MPS PERFORMANCE LONG BLOCKS Mopar Pro Shop strives itself in offering the best Mopar built long block assemblies in the business. It's not just our business, it's our passion. Not only is performance an key reason to decide which powerplant to purchase, reliability & appearance is just as important also. Assembly comes with comlete short block with assembled heads. Additionals parts can be installed for an additional fee. Custom build options are also available. If you don't see what you're looking for, send an email to firstname.lastname@example.org for custom build options.