ProComp/Speedmaster aluminum heads

I put myself out there as an example of a reasonable expectation...
"IF" I can run pretty much out of the box I would expect to lose around 50 lb of weight off the front of the car? I think a reasonable expectation LOL
I would expect better heat dissipation and distribution and with a tall enough gasket be able to possibly use a little less octane in my fuel?
And the performance enhancement I would hope for but not completely expect this to gain a couple two 3 miles an hour in the quarter mile over the stock iron heads?