SNIP
One professional senior says its capacitor
two phase unit
rheem ac model #RCAA-080A SN#CN3D108-M1879-7816
Rheem furnace model#RACA024AAG SN#1177-F2579-3364
SNIP

You have the numbers backwards
You have an 80,000 btu furnace and a 2 ton condensing unit

Both were manufactured in 1979