willis 00

i have a 2000 ss a4. ive spent lots of $$$ on body,interior,wheels now its time to takle the motor. i already have just about every bolt-on, LT headers,holleyintake,lid ,mass,loudmouth,etc. i plan to reinforce the drivetrain at the same time stage3 a4 with converter,12 bolt rear.i perfer to be all motor,and want to run low 11s maybe high 10s. this is not a drag car,mostly show,sunny day car,but i want it to be bullet proof and run, along with reliable cruising.i have my own exp. mech.(he has a 5 sec drag car) my motor only has about 15,000m. on it, should i start with that block or purchase a new ls6 block,6.0 truck block to start with?what block do sponsers crate motors use?what package, etc. is best? i plan on useing all lunati parts,crank to cam.i apperciate any and all feedback, input. thanks willispeed