Distributor cap
I would start with checking your wire work... see if this poor mans diagram helps
The firing order is 18436572
8--------dist---------7
6---------------------5
4---------------------3
2---------------------1
--------------------------------LF of car
--------------------------------or battery
-----------0--0
---------0------0
---------0------0
-----------0--0- (should be #1)
Just to be sure, open the butterfly on the carb and take a peek with a flashlight to make sure there is no other debris in there, or that it is not hung up on something that may have fell in. That being said... I am betting you swapped the #5 , it happens frequently.
JOE