you might as well do a cam, and have the heads worked on a bit.
At least port the exhaust.
You actually don't need the bushings but it's a safe way to go.
w/ mild port job, and cam.... i would expect about 80 true hp.
w/ the whole induction swap (TB, Meter,intake) you could get 100+
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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