Type 3 MC with 944 rear brk.

[1303C2/3]

Hello
I have a set of early Porsche 911 5.5 inch wide steel KPZ wheels which I want to use on my 1969 Squareback. Because of their negative offset (they have an et of 52,3 mm I guess) fitting them to the Squareback would require the use of heavy adapters or spacers. Since the wheels are also very heavy I dont like the Ýdea of running thick and heavy adapters. But if I can locate 944 rear discs (The '83-'85 ones) I'm willing to use the wheels since the rear track will be widened (23 mm per side am I right?) and there will be no need for spacers at the rear.
What I would like to know is.
1. Ýf I use the stock type 3 calipers at the front will the stock t. 3 MC work ok with the 944 sinle pot rear calipers?
2. Will the 944 rear discs overbrake when used with the stock type 3 front disc caliper setup? Ýf so is it possible to restore braking balance by using drilled (like CSP ones) discs up front?
Thanks in advance for any tips.