Kerry,
Try using Crower SS roller rockers. They make them for the 194-292 series six cylinger engines. They're the correct 1.75:1 ratio and the geometry is right, plus they're smaller than aluminum rockres and more durable, and they're available in both 3/8 and 7/16 stud sizes. Crower has an online catalog if you want to take a look at them on line. I'm going to be ordering a set of them for my 194 as soon as I put another couple paychecks in the bank to pay for them. You can get them from Summit racing. Don't screw around trying to make BBC or SBC rockers work, they won't ever really be right.
