I know Tom Lowe put a 292 in his '65 El Camino. It was tight but went in. I am not sure how much more room in the Chevelle than the Camaro. Best way is to take the carb off of the 250 and measure from the top of the intake to the underside of the hood. If you had something collapsable inside of each other that you could set on the base, close the hood and then open, remove and measure the collapsed length. Shouldn't be too hard to figure the difference in height from the 250 to the 292. Other than the passenger side mount, possibly oil pan, the rest shouldn't be too hard to accomplish. Would make for a very nice project when finished.
