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You wouldn't want a gasket between the oil pump body/main bearing cap and the engine block, as this would affect main bearing clearance. A successfull oil pump rebuild requires that the bushing has not got worn bad enough that the gears have moved and cut into the pump housing. If the housing is worn, even with replacement of the shaft, gears, and bushing, the pump will never be as good as a new one. As to whether to use a gasket (if available) between the pump cover and body, the thickness of the gasket will affect the end clearance of the gears. If they are not too tight without a gasket, adding one will only cause more INTERNAL leakage, and could affect how well the pump primes, and it's putput pressure. If you want to seal those areas up, use a very thin application or anaerobic gasket compound/fange sealer. As far as using the cotter pins, I can see no reason NOT to use them, and long as the bolts are drilled, and you have the correct castellated nuts.
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