My 1979 20R, with 245,000 miles, started running hotter and hotter. The plugs were white but I thought the heat was coming from cooling problems until the old truck just stopped. I have replaced the distributor, the coil and the ignitor with used parts that my mechanic says aren't working right. DOES ANYONE KNOW OF A RELIABLE SOURCE OF REBUILT PARTS FOR AN OLD TRUCK LIKE THIS? Please let me know.