Dodge A500 transmission hooked to a 408 sb?

Hi, I was wondering...I will have a 408 stroker and I want to know if a 1994 a500 I have access to will work. How can I beef this transmission up to hold up around 425 hp? What specific parts and pieces will i need to completely need to replace? I know I'm definitely going with a transgo shift kit for some tire chirping shifts. I already have a 2400 stall converter in mind for this build... I am serious about doing this and I would like to make it happen, because I'm trying to fit this setup in my 1970 Dart swinger. Is it possible to do? And will this hold up? Keep in mind i'm keeping this on the street 98% of the time and might take it to the track now and then..that doesn't mean I'll always take it easy either... Please advise!
Thank you,
-ANTHONY