This is about as dead on from what I have seen and asked about at the track. (E-town) I have spoken with a number of racers with that exact 360/380 create engine and the best times returned have been with the 4.10 - 4.30 gear sets. Tire size, car weight, converter, etc.... all play into it.
Now, IF he could ONLY do it in a short paragraph. Or less.