MoPar Brake Upgrade Options?

What would be the best Willwood master cylinder to use on a 1968 cuda with front disks and drum rears
Not power brakes? Wilwood #260-13375 (15/16" bore). They are nice, but I really dislike the way they use 4 very tiny (and leaky) screws to hold the cover on. Don't forget, you'll need the 2-bolt to 4-bolt adapter plate, and also an adjustable pushrod.