manual valve body shifting?

unless you are planning on racing this thing I see no reason what so ever for a manual RVB. a trans go shift kit would be more than plenty , although you may not like the hard shifts on the street. my 727 is completely stock minus the 10 inch converter and shifts firm for daily use. my duster had a trans go II kit and it shifted a little too harsh for my liking being a daily driver.

it all depends on what you are using the car for. if it is just a DD, I would start out soft and work your way up if you aren't happy with it. it is easy to upgrade while the trans is in the car.... my $0.02