Pressed-pin rods and pistons need to have the wrist pin pressed out with a press...This another reason I am an HUGE fan of floating rods. THey go together MUCH easier with NO heating of the rod and they come apart with a simple removal of the wrist-pin lock. I would suggest you you look at getting full-floating rods and pistons...It was some of the best $$$ I spent on my BBC...The only bitch is that full-floating rods cost a bit more...
Chris