If you have good torch skills you can carefully blow the head off the bolts to remove the cams and get to the shank of the bolts without hurting the slots and minimal rubber fire.
I agree with mguner on this reply. We have also used a torch for this, but if not careful, and the inner fenderwell is in nice shape (condition), my brother and I have taken a five gallon bucket and an old bath towel, (second person required) with ice cold water, and while one person was heating with the torch, the other person was massaging the inside (engine compartment side) with the water, but just make sure you keep the towel as wet as possible!! It has worked for us just about everytime. Also, consider this, we been working around cars, since about 10-12 year's old, and you get very experienced after so many years, of trying this and that! Good luck, and we hope you succeed in your venture.