Where can i get the weights and springs used to adjust the timing curve for an HEI distributor. I just want the factory weights and springs, but no auto parts places carry them. The reason i think i need them is because my timeing dosent want to fall back down after it advances. Put a timeing light on the truck today because it was acting funny, and i found that the timeing would varry anywhere between 8 degrees and 16 degrees. It wanted to stick at about 14 degrees BTDC, and then it would slowly fall down to about 10 or 12 degrees. Sometimes it would fall all the way to 8 degrees. So i am thinking either the bearigs in the distributor are worn out or the mechanical advance ist working properly.