im fairly new and know this is old but i had to chime in. i hav a toy and i installed a 5.0/302 and a c4 with a shift kit runnig around 400hp. the funny part is the HO5.0 came out of an 83 merc capri that had a carb! the c4 is tough and i would like over drive but the way i went (39.5s)MPG dosen't matter lol