A later model small-port 3100 isnt as bad as everyone thinks. Just make sure it has the 1.6 roller rockers. I did the swap in my z and then upgraded the intakes a few months later. My engine is from a '98 Lumina. The only difference in my engine and a 00+ 3100 is the valves. My engine still has the smaller valve heads.
If it's a good deal and low-milage, go for it. Everything swap related is the same as the 3X00 swap.
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