After seeing the problems you had starting that engine in a previous post, gotta ask if the vacuum can is good or even hooked up. Secondly and depending on the year of this engine, does it even have mechanical advance as some of the early FE's were only vacuum and with often a double vacuum chamber advance/retard set up. If this is indeed so, only a replacement distributor will 'fix' your problem. Other then that, you need some replacement springs as noted above by nunattax and find someone with a distributor table - which is really the only way to do the job right as spring posts need to be "adjusted".