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It's a definit improvment over the 2.8, but if you can I would grab a 3400, or at least the large port top end parts to put on that 3100 to gain more power, and effciancy.
 

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Go 3400. QUAD4 will require lotsa rewiring, new mtr mounts.....etc. 3400 would be fairly straight forward for you. Theres alot less involved with it.
 

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How cheap is the sp 3100? What year?

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.

-Joseph
 
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