Ok guys say I could get a block with 3'' mains. What is the down fall in the future for this block? Won't be good for NA or turbo power? Be very hard to get parts? Will be harder on parts inside the block? This is on a Dart block. Got a deal on one if I want it but don't want the mains to hinder me later down the road if I want to go faster or want to build a safer more powerful motor.