any benefit to swapping heads?

I gotta say you got one sweet ride. boy there are a lot of conflicting opinions here on this post.

so I'll add my 2 cents. you bought this car as it is correct? well the guy that built the motor more than likely matched the components and it does sound like it runs well. I would worry about compression ratio as the pistons were matched to the 360 chamber volume. if you lose compression with a bigger chamber in the head, you will not be happy. if the chambers are the same and you do not lose compression you will pick up some high rpm horsepower with the X heads. your cam will definitely love bigger valves at the same compression.

that is why aftermarket aluminum heads are so popular. they are not rare mopar pieces, you cant devalue them by porting and polishing them. they have hardened valve seats that love unleaded gas and thick deck surfaces that can be milled for any chamber volume without compromising the structural integrity of the casting. they all have big valves, raised intake runners and modern combustion chambers and flow boatloads more than any stock casting ported or not.

sell the x heads to a restorer and buy a pair of aftermarket aluminum heads and add 50 to 80 horsepower.