I honestly don't think the brake upgrade will make it any faster. I thought drums actually roll easier because the shoes get retracted by the springs. Although I think the brakes are a good upgrade as rotating weigh reduction, I don't see it worth a lot of ET. Now a roller cam and alky might get you a little bit.

You car seems to pull real good to the 1/8 and then peter out, not sure what's going on there? Seems like there are a couple of tenths in a 1/4? Picking up 2/10's in the eighth at your ET is not going to be small changes..