My 37 was born with a 6 and will stay that way,with the 5 speed and 3.55 gears it will keep up with anything on the highway. Now if something would happen to the 235 I would be tempeted to install a 59 or 60 Olds 371,had a 59 371 in a 53 Olds 88 and it would walk away from anything with a stock or slightly hotter 350 sbc and that motor would be fun in a much lighter vehicle like my 37.
