pfft. automatics take the fun out of driving. (that's definatly an opinion based answer.
) will, for what it's worth, i've still got the w58 in my turboswapped 86.5, and i'm over 300rwhp, and have a lead foot. i have no problems with it.
i've also got an r154 sitting in my garage incase something DOES happen!
and to directly answer the question: i'd much rather have a manual n/a tranny (w58) over a turbo auto tranny.
and if you shift fast enough, you wont have enough boost dropoff between shifts to really make a difference. learn to drive!
(not saying i can do it, but it's definately an art of driving the manual transmission, one that i'd like to master 100%)
you can barely hear my BOV when i shift, it BARELY opens, if at all...
-shaeff