You could do a rough calc on that based on what most guys picked up in et in the 1/4. I think most posted between .05 to .1 or even a .15 improvement. If they would post the mph improvements or their actual previous mph you could get a rough idea. Looks like around 50-60hp depending.
Just remember that the timing has to be changed as well. Switching carbs alone does not 'optimze' the combo with the new fuel. It also requires a change in timing.
