350 RWHP is more than I need. So I would say, crankshaft HP will be around 410 HP based on a 15% loss (280RWHP/330CHP).
The car is currently in central Mexico. San Antonio is home though. Once moded I will be testing how fast the SRT6 will go, lots of good stretches of highway to Monterrey. I've already done 160 mph limited but once I take away the limiter I will take this car to its limit. Probably in the new year when the temps are cooler, 60-80 F. No worries, to prove it I will be taking video. Last time I took a photo, hand held.

FYI, I will be buying new parts but thanks to those who have offered.

Cheers.