Help with no spark please

[conoco]

I had my truck in the garage all winter why I replaced the rockets. I pulled it out last week and it fired up right away. Took if for a drive and it ran great. Now I try to start it and it turns over really strong but has no spark.

I replaced the entire distributor
I replaced all the spark plug wires
I replaced all the spark plugs
Replaced the alternator.

I put a new ground cable from the battery to the block.

I have no idea what else to do but I am super frustrated. Can anyone help me out or give me things to check or replace that might fix it. All the other wiring works good. I just dont understand how it fired right up and drove great and now nothing. Thank u