Hey Bob Pretty much all of the big suppliers make radiators for the 47-55 that will do just fine for 300 hp.(walker i think makes one with a condenser on the front along with others) I have some Big Block ones out there that are running allmost stock radiators(new). If your going to run A/C and you have the cake maybe and aluimn rad. How far are you going to go? IFS and the whole deal/
The stock steering box is real tight and has to be moved if you are thinking about V-8 stuff in a stocker.