well your cheapest mod would be spray that would get you 12's for sure on just a 100 shot and for the cost of about $700ish...put it on a button and just let off to let it shift...but before i built a 408 i would put a single front mount on it for about 4 grand and enjoy mid 12's...

heads wouldnt mess with and intake eh i did it for more all motor hp...like i say my complete intake setup will be for sale soon