i dont believe that you can block water ports like that.. you will get hot spots and ultimately detonation..... i know most 289 intakes specify that they are NOT compatible.... did you say that the tech line said you can install that???
You don't need the rear water ports and it's perfectly fine to block them off. Intakes only ever have the rear crossover if you want more places to put gauges or temp switches into the coolant flow. Most aftermarket intakes do not have them, in fact very few do have the rear water crossover. Of course I am speaking about 289/302's, there may be something about a 260 I don't know about.
The rear crossover is unnecessary and totally redundant. The car will run fine without it.
Don't sweat it, your stock intake doesn't have it either. The only reason the heads have ports at either end is to make them interchangable side to side. You can block the middle ports too, that's an exhaust crossover, it'll end up rotting thru the aluminum in time. It's there to add heat to the carb on cold starts. Good for that, bad for performance.
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