Fitted a Porsche 944 (i think)servo to a king and link beam. It's a tight squeeze because theres less space between the tubes. Massive amount of fab work for the linkage as it's RHD. Might be a lot easier on a LHD. You need to see where your pedal lines up to you beam.
I'd guess anything LHD with a bay beam would be straightforward. 68 RHD pedals are the wrong side of the chassis rail, I don't know if the pedals moved when the chassis changed after 68.
Think you will be fine with LHD. I'm pretty sure it was a early 944 servo I used. It's a little more compact compared to a bay one and no breather pipe. Bolts are same pattern and I mated it to a bay master cylinder.
You'll only need to think a lot about it if you've got the '69 beam- September 1969 they changed to a beam with wider spacing, same as on a late bay. If you've got that, I suggest you just copy the late bay design & master cylinder. That being said, I don't know a lot about your specific setup so I'm not taking any responsibility
If you were to have original drums all round, I'd say remote servo so you don't have to use a disc brake mcyl on drums- creates potential issues with incorrect piston diameters and residual valves being incorrectly specced. Just for reference.