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The ABS VI system is a decent system, unlike it's predecessor it's basically trouble-free. Many Gen 2 cars make use it as well. The bIg difference in the 2 designs for the master is the number of ports. The non abs unit has 4 threaded ports whereas the abs units have only 2 threaded ports. Where the ABS equipped car are concerned the master has eliminated the built in proportioning valve assembly (the internals were simply removed) but the non ABS master does. The proportioning valves are under those two large caps screwed into the master body. What I do not know is whether or not the ends of the brake lines on an ABS car are threaded in the same manner as the ends of the non abs cars. The non ABS master & lines are threaded with 4 different threaded pitches & dia retaining nuts so they cannot be inadvertently mixed up.

That's quite right, the castings for both the block & heads are significantly different, to the best of my remembering the engine mount bosses are cast into the block at the same location.