For wires, HEI was standard on many 250's. A factory set for a 81 Chevy pickup would be good (that was remore coil HEI). I personally don't like Accel wires, had 2 sets with at least 1 bad wire). Universal is fine but spend the money to get a stripper/crimper.
Side covers have a stud in place of one of the bolts to mount the coil. If you aren't using it you can use the accessory mount hole on the front middle of the head. This takes a simple strap type bracket with 1 bolt securing both ends, most often seen with round coils.
