Unsure on your elec issues, might just be a fuse gone, worth a try.
as for not starting, V8 like very good ignition componants, so make sure all are clean and working well, if in doubt change them. (plugs, leads, dizzy cap, Rotor arm, Coil) check and make sure everything is clean and moisture free.
best bet is take out each plug spray with WD40 and scrub with a toothbrush, squirt of WD40 in the lead, do the same inside the dizzy cap making sure its clean with good connections.
If you have spark and fuel then you should be ok. But as said they like very good ignition componants