MBM 4 wheel disc brake conversion master cylinder question

Installed the MBM 4 wheel disc brake conversion set on my 1968 plymouth barracuda, from classic industries. What master cylinder do I need to use? My friend says just get one for 10'' Abody disc in front and drum rears should work. Some I look at say "not for 4 wheel disc" Anybody done this conversion on their Abody before? Thanks