What you want are Stage 8 header bolt kit. They are a good kit of header bolts that have a locking ring that slips over the head of the bolt and then there is a c-clip that holds it in place. It will be the best $40.00 ever spent on your headers. Take the time and put new gaskets in place at the same time. The bolts will never come out until you remove the locking washer and the c-clip. If you lose some the c-clips they can be bought at Home Depot for about 10cents a piece.
Let me know if you have any questions. I did a google search and found them ranging from 37.99 to 45.00 So go for it. It will be worth it.
Also let me know what you think when you get them done.