A supercharcharged engine can be very streetable.
You'll need forged low compression pistons and the best piston rings you can get.
A cast crank and stock rods should be fine for a street engine.
You need a cam with lobe center in the 112° range so the blower won't blow out the charge through the exhaust valve due to cam overlap. Lift and duration should be a bit more than stock.
If you intend to use the stock heads open up the exhaust ports as much as any possible because they are so restrictive.
Use the D8OE heads with 69cc combustion chambers as found in '79 Mustangs, the big chamber volume will help to achieve a compression ratio low enough.
For a blow through setup a single plane intake is recommended to avoid fuel distribution problems.
Check this link from Mustang Magazine January 1989 edition on carbed supercharging:
>Super Charging 302<
Furthermore I recommend the book "A do it yourself guide to street supercharging" by Pat Ganahl.
Simon