The machining of the plenum is straight forward and it wil be obvious when you try to install the electrical plug onto the injector over #1.
As far as the conversion goes... If you recall the tight clearance when removing the injector cap screws, some required slight dremeling of the plenum for tool clearance. Keep this in mind because the inj caps sit flush to the fuel rail.
The conversion kit uses the same style oem cap that's machined slightly on the face where the inj recepticle is located, but is the same on the upper and lower sides. Then the cap sits on top of two spacers roughly 1/4" or 4mm tall. The reason for the spacer is to accomodate the adapter that fits over the end of the new style injector and is then is installed into the rail. All this is what adapts the new style injector to the old style rail/plenum. The new cap screws are allen head rather than phillips. Getting the injector installed wont be the issue. Installing the cap with the additional rise, spacer, cap, washer, and screw, will be the issue. If you drop one piece of hardware it will be a surgical proceedure to find it much less install it. If the plenum has never been off this may be a good time to consider the adventure. You could delete the coolant lines under the plenum which will bite you sooner or later. It will allow you to change over the injector connectors with the new style. More than likely all your rubber PCV and idle air hoses are petrified like fossils and will not be reuseable so consider the silicone kits to replace them. Also very important are the fuel hoses. After 20+ years they are solidified also and will require change. So buy yourself 3ft of 5/16" fuel inj hose that's rated for high pressure 60+psi. The hardest part of the whole deal is trying to save the hoses as you remove them to remove the plenum. If you just cut them all off as you remove them the job will go much faster.
Good Luck
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