Ok gurus, I need your help. Just got the 305 replaced with a 350 and boy is it nice. I found the options sheet on the fender well and it says; "Option No. 1GQI Rear Axle - Standard". What is this telling me? The 350 went in with an RV cam, Headman Headers, Edelbrock high performance intake manifold and Edelbrock high performance Carb. Also new exhaust system with flowmaster and three inch pipe. Soon to be followed with a new set of plug wires from Summit. Boy is it clean and compared to the 305 it's a powerhouse. Just got the first 500 miles on it with 150 of those in the mountains of western Wyoming grouse hunting. I can't beleive the power difference. I can't quit smiling.