XE256 in a 318 ?

According to the camquest program, the 256 has 3x the useable torque curve over the next largest (the 262), and is only 10 HP less at peak.

I've always though it would be a great improvement over stock without needing to change anything else.

The first of my 318s that I will get into already has headers, and I found a great deal on the Summit single pattern 6901, so I got that, but I'm very anxious to see the 256 in a light car.