Cooling issues

shroud will help
thermostatic fan will save some hp and be quieter 7-9 plades
plug the holes in the core suport except the one for your cold air to carb
valance/ spoiler helps
50/50 helps with some water wetter
what water pump? solid or plated impeller or just bent metal fins
what rrr said but I think 340's had a larger pull due to higher revs
is this an AC car?