Scarebird Disc - What Master?

So I decided on the Scarebird route for my disc conversion, but a few questions on the Master:

They suggested a late 80's early 90's mini van power master, which has a 15/16 bore, but I would have to "modify" my pushrod to fit the piston.

Is there a master someone else used with their existing pushrod, or a combination of a master a pushrod from a different year car?

I have a 70 dart with SBP.

Thanks!
this is the one I used for my 66 dart using scarebird setup. (I used it on a 65 satellite also, it had a 1 1/32 wildwood master on it and was terrible!) the plymouth now stops better than ever . it does have a longer push though. about 1 inch more than the other one. A LOT easier to push! there are a couple more that I have used this master on and they have performed well also. it's from a 73 dart 360 disc/drum combo.
http://www.rockauto.com/catalog/moreinfo.php?pk=966993&cc=1499091

WRONGPARTNUMBER this is driums all the way around. remove residual valve if you want to use it with scarebird conversion

Use this insteadRAYBESTOS Part # MC36406 Professional Grade; Bore Size=15/16"
Front Disc brakes; Rear Drum brakes;

http://www.rockauto.com/catalog/raca...&parttype=1836



THANKS Inertia (my bad):oops: