MAF ???'s

Yes, you definitely need to "complete the total package" with opening up your air intake. You have all these mods to your motor that increase the amount of air and fuel that you are burning. So you are basically choking your engine of air right now with the stock MAF in there. Is that what you have? I'd imagine that would boost your mph some. Just putting a bigger MAF on a relatively stock 302 would not benefit the motor enough to actually "feel" the difference. But in your case...since your motor's intake of air is being somewhat choked, I think you will feel the difference and see the difference on the time slips. I'd go with a C&L 73mm for your application. Let us know if it helps boost that mph.