We tried putting on a K&N cononical high flow filter on our 88GT with speed density. The car idled like crap, I was told the speed density couldn't compensate for the addiitonal air flow. We took it off and put a stock filter back on and it idled fine.
There's others on this board that've been very successful with tuning speed density. We're planning on upgrading to MAF with a Ford Racing upgrade kit according to the research we've done - you simply have to touch one wire on your existing harness, have to swap out your EEC, add the MAF meter, new throttle body and you're good to go - hopefully.
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