You will need to use brake hoses for a 72/73 b-body on early A-body. You will be mounting the calipers behind the spindles verses mounted in the front like a 73 -76 a-body. Because you will not be able to steer, The calipers will hit the wider early stabilizer bar .
Your metal line is at the rear of the wheel on the body. On a 73-76 there is a length of metal line added to the hose to go behind the spindle moving the hose to the rear when they are mounted in the front. B-body hoses do not have that extra length.
I use them on all conversions and swap the spindles from left to right on 67-72 a bodies unless you are using the 73-76 control arms and later stabilizer which is narrower. The picture below will show you the difference in the early to late stabilizer and how much wider the early style is. When the caliper is mounted in the front it will hit when steering the car.
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