2 Questions about the SR: EM Gasket & Igniter chip

[rocksteady_racer]

Ok my first question is I just got my exhaust manifold off and the gasket that was on there was stuck to the block and fell off in pieces, it's the stock nissan gasket. How do you remove what's left on the block and intake manifold? Do you use a metal grinder with a metal brush or a light grain of sand paper?

Next question. Igniter Chip. Is there any way to replace the igniter chip with something else like an MSD ignition or something? I've heard they break all the time and I'd rather have something that lasts longer. Thanks in advance.