They are 675 Golspie in Winnipeg. Off Gateway Road, a few blocks north of Monroe. I don't know if they will rebuild for you directly. I did it through Piston Ring here in Morris. I've had them do a few water pumps also when I wanted to keep a correct dated water pump.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
Carberator Rebuilders does this also. My 2 barrel was flow benched by them.
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Prince Edward Island
'64 Parisienne CS "barn find" - last on the road in '86 ... Owner Protection Plan booklet, original paint, original near-mint aqua interior, original aqua GM floor mats, original 283, factory posi, and original rust.