question for carb guys

[429mustang]

I don't know what the deal is, I've reset the floats 3 times, it ran good each time for about 2-3 days then out of nowhere would load up real bad during full throttle and run rich all the time. For a while it would be so bad that I couldn't give it full or even past 1/2 throttle without it almost stalling after it would take off for a few seconds. The last time I set the floats it did the whole deal with it loading up for a while, but now it just runs rich all the time. I put a 1 inch open carb spacer on tonight, it bogs out a little when I go from light to full throttle, and I can't tell if it's helping in the upper rpm yet caust I think I need to re-adjust the kickdown cable (700R4 trans), it doesn't downshift most of the time and won't rev high before shifting so I still have to tune it a little. If anyone knows who has the best prices on Mighty Demon or Speed Demon carbs let me know.