Need help, R3 vs Hemi, 6.1/6.4,,turbos??

Boost on Modern Hemis is limited to 8lbs. Anything beyond that and you are taking a chance of a rod moving to another place. I had a 6.4 with a supercharger and water meth kit.. Was fun for sure and was quick. Was it fast to me.... No... If you want to go fast and save some money put an LS in it with a turbo on 12lbs. No issues at all and the car would probably run in the very low 10 to high 9's depending on if it hooks or not. With this said I am building a 67 Fastback Barracuda with a 408 and twin turbos. Mine will be blow through carb for now with a F1 upgrade in the future.