Two questions

I see a few ppl selling Sanderson Shorty Headers will these work on my 68 Dart 360engine, w/manual steering? I notice that they go straight down. Are these better than manifolds but not as good as headers?

Also I just bought a 360 w/a nicly build 727 behind it... the 727 has a new 3500 stall converter on it... What are ideal gears to run w/that high of stall? I was told 4.10 gears are... but this is a street rod.. I'm not saying I'm gonna take her on long road trips or even my daily driver but I'd like to enjoy her if I have to take her 25miles to a car show or sommin.... Are 3.23 to sm fo a 3500 stall or will it make my car feel slugish?

Jason