I have not used an ABACO meter personally, but I hear they work pretty well. They just look fragile to me. I would be hesitant to use one in blow through (based on looks alone).
Either way, in order to properly tune it, you will need to program the PCM. You cannot run 42# injectors and MAF without potentially damaging the engine (without a proper calibration). I know it has been done for years, but how many posts do you see about head gaskets in the 5.0 section? (I have posted about this in another thread)
As far as a cost effective tuning option, I am not too sure I can help as I really like the SCT PRP. Unfortunately it is expensive and it takes a long time to learn. My first recommendation is to get the car custom tuned in person by a reputable tuner who is fluent with the 94-95 processors. Then, if you want the PRP, save up and buy it later. That way you can spread out the cost. Get the file from your tuner and tweak it yourself. This makes sure that the important (fueling and spark) is done, then you can tweak on the drivability until you are happy.