coincidence or did i cause this,

[wellcraftv20step]

Hey all , A while back I picked up a beautiful 22 Imp walk around with a 5.0 mercruiser Alpha 1 for my son in law, I started it for the first time last week and it started and ran great then I started it a couple days later and it ran perfect again. Here's the rub . I decided to do a compression test and all cyl,s registered about 150 ,so now I put the plugs back in and I cant start the engine. No spark at the thunderbolt iv v8 22 ignition module. my question is could this have been caused by the constant cranking of the compression test or is it just coincidence, and I did change rotor, cap, plugs and coil