must agree with Dr. Hunt. for what you are already spending, another $350-400 for rods and bolts that you will not have worries about, should be a no brainer. i used to have a 383 also and 6200-6500 with a blower on top was the most i was spinning. also if you are worried about rpm's them buy a matched f/i cam to match your heads and rpm worries. there are alot of good companies out there that are only a phone call away and willing to lend some help.