blew my 3.08 diff in my 68 bird the other day (thank god for that!) - got some 3.55 gears to put in place, have a powerglide behind the 350, but wanna get the bird to move off the lights a little quicker. 350 has a holley 600, some headers, torker manifold (probably too big) mild cam.. my dilemma is - do I keep the "glide" or go for a T350 or T400....and will the turbo350 or 400 make the car accelerate quicker??