As already said,a little too vague.

Race?
Street?
Fuel wanting to use?

Unless you KNOW where it came from and or how/who used it,buy accordingly.

I have never bought and used a complete engine,just parts.
90% good experiences.

70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!