340 replacement block.. with a roller cam?

I used a resto block with indy heads. I am running a 700 lift comp solid roller with mopar roller lifters. My block was cut on a cnc mill for the lifters. The lifter bores are alot taller on a resto.block. You can have the lifter bores keyed for custom lifters. Or have them milled down for shorter lifters.I Agree with the rpm input. I shifted mine at 8000 and Higher. I also shifted it a 7000 and 7500. Being over 400 cubes the motor likes the lower rpms. I love to twist the motor up to the extreme. So far mines taking the abuse like a champ.