Head swap worth 50 HP?

I had a post on a few weeks back about my 92 coupe running out of umphf @ 4600 rpms. Thankfully, some of you guys had some really good ideas about what the problem could have been.

I used an engine simulator to compare the actual chassis dyno to a virtual engine dyno and the curves were so similar it was scary! I entered everything from IVO to EVC cam specs and intake flow... etc.

The difference in the two virtual charts are from Windsor Jr.s to Victor Jr. heads only. I wanted to post the charts to see what you guys think....

First chart.... ACTUAL CHASSIS DYNO




Next chart..... VIRTUAL ENGINE DYNO on exact setup as chassis




Final Chart..... VIRTUAL ENGINE DYNO w/ head swap




Thanks guys

331 stroker, 10.4 to 1 SRP pistons, 4340 crank
70 mm TB
73 mm MAF
30 lbs injectors, 190 lph pump
diablosport chip
mac headers, highflow cats, force II flowmasters
bbk ssi intake
world victor jr. heads
comp cams pro-mag 1.6 rockers
lunati custom cam (110/118, .548/.548, 230/238 @.050)
etc.