You would be lucky if you got any more than 7 HP.
Do the nitrous...get a used kit for about $250 and save the rest.
Save for the heads.
My car went 12.50's on a 75 shot and 4.10's.
You have a stick or auto???
If it's an auto save for the tranny rebuild.
You will almost be a 1/4 of the way there.
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.stangnet.com
11's coming soon!!!!
Heads,intake and cam are all here