1963 chevy c10 bellhousing question

[nutsfor59]

hi,and thanks for the good advice which i will look intyo seriously,i presently do in fact have a valve cover to firewall issue wich i have taken care of but what is this 454 flywheel deal ???,i have not heard of that,is it a balance issue ??,how do you tell if you have the correct one ???? before i rattle and shake my engine apart !!!,that really scares Me !!! currently trying to figure out the year of my 454,i think it's about a 1987 block,i put a older points distributor and carburated intake etc,but i have no idea what to use for tune up/timing specs,idle,dwell etc,etc,any advice you offer will be greatly appreciated,please reply asap,thanks !!