What should i change to get into high 11's?

Like others have said, you're going to need the whole package to get your car to ET well (power + suspension that works + sticky tires)....but here is my motor build if you're curious:

360 block, 410 ci, 10.8:1 compression (93 octane pump gas)
Eagle 4.00 steel crank, Scat I-beams, Diamond pistons, total seal rings (file fit),
ARP main/head studs, Edelbrock heads stage II ported by Ryan J @ Shadydell,
Small solid roller 248/254 duration w/ .576/.582 lift, Victor, 750 dp,
4.10 gears, spool, 35 spline axles, full Caltracs setup,
727, manual valve body, 8” converter, 28x11.5 Hoosier QTP
3200 lbs, street trim and with 3 inch Flowmasters.

This combo makes close to the same power that your brothers car does (never dynoed, but going from trap speed it is close), but it gets it all to the ground....it runs low 6.80's @ 99+ mph in the 1/8 (which is ~10.7 in the 1/4).