340 replacement block.. with a roller cam?

Also, I've noted stock blocks can go preety far. Of course pushing the envolope is dangerous and pricey apon failure. A 48* block is worth it IF your racing and racing for the money. Expensive? What else is new in racing? Worth it? Extreme power levels can be had over the stock block much more safely with longer life.

A 48* block is probably not worth it for a street driven car unless your really looking to take no prisoners, just courpse's.