IIRC this is your V* with a busted Dizzy? If so then I'd firstly ask if the chain tensioner works correctly?
If the gears look ok and not significantly worn you could replace the chain on it's own, it will take up the wear and return things closer to original. If you are replacing the gears think about an adjustable timing gear and get the cam timing spot-on. In truth I don't think you need to bother though, just do the chain.