Actually for the latter style B style Chrysler engine they are not all that bad (heads flow well and respond to pocket porting like the rest of the latter B/RB heads). It does have a cast crank and if you go the stroker route (basically using an RB crank and custom pistons) makes a heck of a motor. Otherwise, like Bob says, loose the emissions crap and use the standard MOPAR B/RB hop up parts.