This is just my

NOTE: This is counter to what everyone else is saying on here.

Having been there and done a 70-B Body disc brake swap, (from 4 way power drum) I would personally recommend the setup from master power brakes...

If you think you can do it any cheaper/ any
better I would tell you from bitter experience, that's not really true.

You can do it cheaper...
But your braking performance/experience behind the wheel, might not match your expectation.
and that's why your converting in the first place isn't it?

I would strongly recommend that kit with the power booster and the master cylinder from
MP Brakes...

Your brake lines to your drum metering valve
can stay there, just get the disc brake
A-Body metering valve (from inline tube)

That way you don't change your brake lines...

Best of luck to you either way!!!

Also, your drum brake steel wheels if they are
original 14x5 drum wheels will not fit.

you need a 14x5.5 disc brake wheel.
Check you salvage yards 1977-78 Plymouth volare
Dodge Aspen...same wheels slightly larger offset
They work perfect with the A-body swap
(Which is all the MP brakes kit is really)...

PM me if you have any questions/concerns...
Once you get the kit setup right..
it is a BIG improvement over front drum!

Just remember, at the end of the day..
The KEY To all of these parts working right
is pressure out of the master cylinder.
There is an excellent article on the MP Brakes
website which explains all of this...
It's a GREAT READ!!!.. please indulge..

My