Did Burke most likely agree or disagree with the radical course of the French Revolution? How can you tell?

Yes he did, Because he opposed the revolutions plans, not so much the revolution itself.

He disagree with the revolutions plans, not so much the revolution itself.

Because, he argued not the substitution as such but its programs: the French revolution needed to abolish the past of France and found a new, complex system, they make it work in actuality (and Burke said that it would not work). On the other hand, the American rebellion did not murder the British legacy: the different individual rights, the common law etc. For him, the uprising was supported by the very laws of British law.