Originally Posted by Broly

Nope. Goku's Kamehameha multiplies his power level. When he fought Raditz, he charged up a Kamehameha to fire, and Raditz noticed his PL increase from 416 to 1030, which is a near 2.5 increase. So we know his level of power does flare up when he unleashes ki attacks like the Kamehameha. Then, later we see Piccolo charge his Special Beam Cannon. Again, Raditz notices the change in his power level. From 408, Piccolo's ki rises to 1330. That's over a 3 times increase in ki power. Raditz had a PL of 1,200. That's like a 1.1 difference, and it was just enough to kill him. Goku's charged ki in movie 8, at that point, in my opinion, increased his power level 3 times what it was. I think it could be a bit more because of his Super Saiyan increase though. Broly was not affected at all by Goku's charged Kamehameha Wave. So, that would mean that Broly is at least 3x the power of MSSj Goku, if all this were indeed in order.

Personal estimation:
MSSj Goku [Movie 8] - 12,000,000,000
LSSj Broly [Movie 8] - 40,000,000,000