Might be better to just invest in a Proform Main body.bye the time you ship it get it milled and shipped back you'll be about the same $.The Proform Maind body should flow a bit more CFM.
70 Duster W8 motor. 1.29 60ft 5.79 1/8 at 120 mph glide with 1.80 gear @3170 lbs.
