Brake Booster Mounting: Bellcrank or Not?

[damnyankee36]

I am converting a 68 C10 with factory power drum brakes to power front discs. The factory booster has the bellcrank design which I am not familiar with. From what I understand the bellcrank takes care of the required pedal ratio instead of mounting the pushrod lower on the pedal arm.

I looked at MP Brakes and their boosters have the bellcrank for 63-66 and 67-72. CPP's kits look like they have the bellcrank for the 67-72 but a straight pushrod for the 63-66.

Is this standard procedure for 67-72's? When I installed CPP's booster in a 66 the straight rod work very well.