i've got a 67 bird with a stock 326 the rear gears are 3.08 and the trans is a super turbine 300 2 speed (not a powerglide). its all original but i'm finally giving up...it needs more gears. with your foot to the floor...its single shift at 70mph is just boring and the average 305 camaro passes me with ease. i'm wondering if the 200r4 or 700r4 with the adapter is the easist swap? as far as modifications and parts to buy?