Top speed of an SB stroker

my 1964 v 100 273 2b when new with 355 gears and 3 speed would get scary at 120 mph front end would get light still had engine left but no more speedo ???? and remember that was in 1964 biais 4ply tires best you could get. Iam 64 years old and I bought a1964 valaint and installing a318 mag efi with 518 trans in my second child hood...nice seeing your ride good luck be safe god bless you will need it .....bonehead