Master cylinder question...

[Oregoon]

So, I'm close to doing the whole rear-end/fivelug/lowering/disc conversion on my '66 Burb.

Naturally, I'm going to lose my single master cylinder in favor of a dual, with a proportioning valve.

Here's the question: My '66 is already power-assisted. Can I just replace the single master cylinder, and if so what year dual do I use?

Or do I have to replace the entire booster and master cylinder assembly with something '72 and up?

[LILRED66]

A 72-up dual chamber master cylinder will work with your factory power brake booster.

[Oregoon]

Thanks! That's good news for a light wallet...

[joe231]

'71-'72 will work as a strictly "bolt-on"
some time later they changed and would no longer work with the stock booster..
just looked at a '73, they won't work
here is the pic, notice it doesn't have the same deep recess as the '71-'72

the '73-up style is what was on my truck before i swapped and it wouldn't work with the booster

here is mine

it is for a '71, got it from Auto-Zone $38 for new, not reman
LINKY