You stated the donor truck is a 1969, in 1969 they had 6 lug front & rear and drum brakes front and rear so if your getting a 69 with disc brakes in front & 5 lug front & rear someone has then converted it to disc brakes & 5 lug. If thats the case you need to find out what year group parts were used to convert it.
GMCPaul
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