For street fun, I’d shift at 5000. That engine is making huge power at that RPM, even without knowing. There’s little need to twist a 455 much more. If you make some track passes, you could experiment with different engine speeds, likely with little difference. You’re not competitively racing your Dads old car, just enjoying the heck out of it (finally).
Find out what all options the chassis dyno folks can provide during your session. They may have some sensors that can point you in a direction, if needed tuning wise.
Glad you are enjoying it!!!
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
Last edited by 77 TRASHCAN; 10-04-2021 at 11:39 PM.
Reason: Osborn
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