TW heads and removing roller lifters?

the heads hang over the lifters. the push rods go from the lifters THROUGH the heads to the rockers. the reason i am asking is because i think when i did the head and cam swap i tried to pull the lifter out but it hit the bottom of the head. but it has been a while since i did it and i dont want to waste money on head gaskets if i dont have to remove them.
 
You do not have to remove the heads to get to the lifters on a 302. You just have to pull the valve covers and loosen the rockers to get the lifters out. I had to do this on my motor with TW heads when a couple of my old lifters collapsed.
Kevin