That ud is choppy but still very streetable in a 340-360 but not bad at all manners-wise. But in a 10:1 408 it's all about wall to wall torque, awesome kick down and roll on power coupled with a great, 'just right' idle. I've built dozens of strokers of all makes and to my mind and experience there's not a better all around grind for a mild street 4" stroke SBM; throw on a pair of decent heads, 1 5/8" headers and an RPM or RPM/AG intake with a 750DP and you'll have the perfect combo.
With this cam's lobes the 108 lobe spread will not upset a 4" stroke motor, you put the UD in at 102 in a heavier car (like a B or E or Truck) and 105 in a light A-body. Gearing really doesn't matter, the motor has such good all-around torque (like a wall to wall "sweet spot')it really doesn't care, and this cam's timing doesn't give you a ton of effective @ .050 overlap anyway. For a vert something as simple as a factory 340 or 383 road runnner high stall vert is the perfect 'low buck' match but a tight T/A 10" is even better.
What a lot of people don't seem to get with long arm motors is that cam phasing can be every bit as critical as the grind itself, And I've found you need at least 228-230 degrees on the intake for a 408 to be happy above 5K, with conventional heads and valve sizes a too small profile will hurt the top more than it helps the bottom.
