special engine tool


what kind of wrench works on the center 2 manifold nuts?   a home made one?   use a cheap box end and grind around the sides until it just slips on?   grind slow and keep it cool or dip into water?   does it really matter since those nuts shouldn't be that tight?   wanting to change gaskets.
also on distributor advance,  does one pull the breaker plate to be sure the advance is not stuck? any secrets, it's not going to fly apart with a hundred springs is it? like the cloth snake in a can....   thanks,  Paul Rinehart

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