I have a 49 chevy pickup. I have just got the thing to run today. I want to be able to move it but i am not sure of the shift pattern. I know where first would normally be(on a new vehicle) i have reverse. I am not sure if it is still original. I have put it down where second would be and the thing will barely move then jumps out of gear. Should I try to hold it there or is it the wrong gear? I can not back it up because I have a huge pipe rack about 2" from the rear of the tuck. Also I am using unleaded fuel. Will this hurt the motor or not?