might not be enough..coz..jfk is  a busy airport..i was travelling the same route last summer.. and it took me like an hour and half to get off the plane once it landed... and there is this port of entry thing that takes a little while. but dont worry they will fix you another flight..if you miss it..
in my case i was stranded in the airport for about 7 hours..but they provided me a hotel room and a $ 75 worth of coupon..which i could use for food and other stuffs..basically like a gift card. dont panic if you miss the connecting flight..they will take care of you!!

hope it helps!!