You dont wan- a rebuild a set of J heads do ya?just guides seat work maybe some decking...or milling, I forget the terminology where you flatten the sealing surface on the millin g machine.
Not this guy. Lol. I sold off my last five small block Mopar heads for 20 or 25.00 years ago so I wouldn’t grab a grinder and start doing something stupid. Now that I have a valve and seat machine that was even a smarter move on my part.