Currently I've got a 78 K20 with a fully rebuilt 454, SM465 and a 205, 3:73's and a 44front/14bolt rear. The tranny is a "manual" clutch, no hydrolics. Terribly slow shifting, and a general PITA to drive in traffic especially stuck in 2-3 hour jams in blizzard conditions on the I-70 corridor here in Colorado. I've been considering swapping to an auto. Is the Turbo 400 my only option? For those of you who have done this any advice would be appreciated. Thanks.