2001 Bonneville Starting Issue

Hi all
I have a 2001 Bonneville that is refusing to start. It's been sat since 2019 had carbs cleaned, it has spark but is refusing to run still. I have measured coil and leads and they seem to be in tolerance with the Hanyes manual. Would it be the main ignition unit that could be faulty maybe? is there anywhere these can be tested? I can't think what else could be wrong....