Exactly Mick, if it's a worn out casting, or other hard parts, it's done. You have a bearing go bad, have a total burn out, it's toast. It eats the hard parts, no rebuilding can fix that without replacing the hard parts.
Not sure about AGR pumps, they were good at one time, as were the boxes, but the quality of the boxes dropped off so bad, no way would I trust a pump these days.
The Borgeson new pumps are good, but they don't list the psi/flow for them, so they are probably pegged. 1200-1400psi, 3.5-4+ GPM. So you COULD have a box valved for that, but you need to know what to ask for, and the places that are reputable now, might as well let them choose, and source both the pump and box from them. Turn One is a good example.
As good cores dry up, eventually, that will be the only option, unless you go to a type II pump. That's why I just cut to the chase.
Do a search here on how many folks had problems with replacement boxes, and you will see what I mean. In a number of those cases, it could just be the pump, or technically, the combo of pump/box valving. And all the guys that say the jeep boxes are the bomb, will eventually be in the same boat, if not already are.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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