1980CutlassLs

Hey guys have a few questions. I bought my cutlass from my great grandma has 25k on it. Just put a brand new 307 long block in it with a custom made cam threw a double roller chain and a electric fuel pump on it. I need to convert the distributor and carb to vaccume everything is electronic and it wont run when its plugged in. Any thoughts on parts to use for vaccume replacements?

Also currently have a issue with the rear end vibating have replaced all joints and mounts new tires even put a new sheeve in the tail of the transmision. Still shakes i dont have any rear end noises but currious if i have a bearing out.?.?
Any input would be awesome thanks
Brandan