If you have good compression I can't see any reason to pull the head. Were the symptoms EXACTLY the same before you changed the plugs and wires? Put your timing light on each of your plug wires to confirm that the plug is consistantly firing in the cylinder. Do you have one of those spark gap arc measuring devices that lets you measure the distance of the spark? ($5-$10 at autozone). How's the distributor? Those Marelli distributors often don't get the points changed because it's such a hassle. If it's on just 2 & 4 maybe the cap? Keep us posted!
Bill
Bill