whats wrong with the engine currently in it?
most bang for the buck would be a stock rebuild with a set of aftermarket heads, would be good for approx 310rwhp, if you want more than that you'll need boost
a stock rebuild can be done for 900 add another 1200 for the heads
24 lb injectors are about useless, just step up to some 80s ~$380, and drop yourself a high flow slot maf in it ~$300
tunes usually run about $450 at most places
figure about ~$3500 all said and done
this link has a ton of good info about sbf's