After all these mods I run 14.5?!

[Unit 5302]

I think I posted earlier, if you are using the factory tach, it's not always accurate. Which is why shifting higher can help. Yes the heads will move your powerband higher as well.

A 14.28 with a hot car is a significant improvement over 14.5. Try going to 5800 on the stock tach. The upgraded MAF meter should be helpful, but it will need to be recalibrated for the 19lb injectors, and it's a little big for your application. If you want, picking up a Cobra 73mm MAF on Ebay could be a cheap solution? I haven't priced them.

What's your fuel pressure at? I agree, you should be able to get your 60ft to drop a good 2 tenths. Remember 2 tenths on the 60ft is worth up to 4 on the big end. That would put you well into the 13's.