Welcome aboard!

First it's unlikely that you have an "original" 292. 292s were usually used in the bigger trucks C20 and above, unless special ordered. Look for a build sheet in the springs behind the seat, probably long gone. The reason for the previous comments are the "cooling system bypass" wasn't removed till the early 80s. Are your side covers 6" high?

Larry

I don't own a vehicle that isn't old enough to drink.