596 heads on -68 340

Hi, I currently have J heads with 2.02 intake on my stock 340 but they are in bad condition, would need a full rebuilt. Theres a set of these 596 heads for sale and I thought if they would be any good for my engine. They are aerohead reconditioned heads. As I said, the engine is stock as far as I know. It has TTI headers and rpm intake, not sure what the cam is but I propably will change it if I replace the heads. I know theres a lot of discussion about these, but all threads seem to be about 360 basements.
Please give some advice, thanks.