What type of fuel and how much boost are you planning on running for your street driving?
The last blown pump gas Street hemi motor I built and dyno tested(4.250 bore with 4.375 stroke) had 9.2 to 1 mechanical compression with a Littlefield 10.71 12 % under driven for CA pump gas with a set of the Carb shop 1050 CFM, I think custom built blower Dominators carbs. That motor made 927 HP at 7300 RPM with 33 degrees total timing on 1999 91 Octane CA pump swill with 7 lbs of boost We had made a bunch of pulls testing the timing and jetting first to get those results
We switch the upper and lower pulleys to make the blower have 13% over drive which made 12.5 lbs at 6500 RPM , we did first switch the fuel to Union 114 octane race gas and took 8 degrees timing out of it so it had 25 degrees revved up, the motor started to go into detonation at 6600 RPM so we stop pulling it. That pull made 1024 HP and was still gaining HP at 6500 and started loosing it at 6600 RPM We made one more pull and moved the timing up to 27 degrees and the motor hated that
IHTHs