Originally Posted by: TrinivaltsI got an E7, G, A), in funky rhythm, plus an E7, C7, A7

Hmmm... you won't find all those chords in a single key unless you're substituting in the dominant sevenths, which strictly speaking only occur on the fifth degree of the parent scale. Ignoring the sevenths, the E G A & C all occur in the G major scale, so it might be worth playing with that, or a mode of it...

Pentatonics are generally safe over dominant seventh chords, and Mixolydian works well too - you might need to jump about on this one, and have a read up on secondary dominants - here