HEI Conversion Done still not starting

The can is the radio suppression capacitor (condenser.) You may or may not need it, depending, just listen to the radio on AM if you have one. You can buy "generic" suppression caps at any decent parts store.

I don't quite understand your description of the wiring and relay?

LET'S BE CLEAR..................

If for some reason you don not have the bypass circuit (brown, IGN2) hooked up, you won't have spark while cranking the engine WITH THE KEY, but you WILL have spark if you are jumpering the start relay, key in "run."