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Sheet metal and paint work for a restoration always come in over budget - been there, done that, got the Tee shirt!
If you can find a genuine Volvo pump for a nudge over $100 that is a reasonable price. Last year the Melling pump from RockAuto was my lowest cost option after you included shipping and handling. Recent inflation seems to have adjusted that price quite quickly. On the basis of weight, the Volvo pump does feel like a toy compared to the Melling pump; but, weight is not an accurate indication of long term durability.
I don't know whether all the IPD reenforcement rings fit tight. I do know that on my original pump it was a bugger to get the ring on the pump shaft and the ring seemed to squeeze the pump shaft slot together enough to make the pump really hard to get it back on the drive gear shaft. In retrospect, I am thinking that the tight fit might have pushed the gear into the end plate causing my wear problem. My original Volvo pump had gone over 130,000 miles without issue. Its only after I 'improved it' that it suffered the low oil pressure after about 5000 miles of casual use. I did pry the ring off the old pump; but, decided against fitting it on the new pump, The old pump had gone 130,000 miles without breaking off the pump drive!
If the pump end plate shows no signs of marking, a plastigauge says the end float is good and the tooth flank clearance is good, then the original pump is probably just fine. If you can't find a spec for the end plate retaining bolts, on the web you can find tables of recommended tightening torques for different bolt sizes that you can use as a guide.
https://www.boltdepot.com/fastener-information/bolts/US-Recommended-Torque.aspx
Although not explicit, these torques are probably for steel threaded holes. The only references I have seen suggest a reduction of about 15% for the torque when the thread are in aluminum.
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