Back to the original post, I have a similar motor in my FFR. 3.55's with a 5-speed. Without a doubt, the motor will be a high-RPM motor, and the suggestions for more gear and an AOD are right. I used a Howards Cam, and the HP figures at the crank close in on 440. Also tough to get a carb just right. I ended up with FI. On the track and limnited street, once the came "comes in", it's definitely "Hang ON" time!
Ask lots of questions, compare cams. I eventually made up a spreadsheet comparing the different cams, so i could compare the specs, and produced HP when I could verify. (I can e-mail if you want it)
I started with a seasoned 68 302 block, SCAT 331kit and 10.0 CR. Torker II open plenum. Went with a Quality Link-bar roller lifter conversion, sayed with 1.6 rockers to be safe. Make sure it is put together right! Also, a nice hot spark really helps.