Proportioning valve question

I'm going to try to keep this simple and at the same time hopefully obtain a simple answer. I have a 68 Barracuda /6 with 9 in drums. Motor is out. New motor is waiting on clutch at the moment before it goes in. Observed the distribution block on frame rail and wondered if, while engine was out, I could install proportioning valve. Brake wise, my intent is to use Mopar front disk and rear drum. This leads me to the question; is there a replacement proportioning valve that fits the same place on frame rail and what do you guys do for brake lines between new master cylinder and valve? Bend to fit or is there a supplier out there for just such a change. I'm going to guess that none of the lines fit; even the brake lines to the valve. Thanks.

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