There is quite a bit of work done to that 4g52 - that is possible, actually even low for the work done. The 160HP with the baker setup was on an otherwise stock internals block and head. With the head shaved for higher compression, bigger valves, ported head, Tri - Y header, and the sidedrafts tuned to the motor, 185 - 200 HP would be where you would be on a g54b.