Your bottom end is fully good to over 6000, however your overall breathing system with that stroke is done by 5500 at best, even with the ported heads , and I am assuming they flow like 240 intake cfm @28.
Look at it this way super stock 455s with ported iron D port heads flowing 260 cfm and running a far bigger roller cam are shifted at 5800.
Even SD 455 super stock motors with there ported SD heads that started life at 185 CCs and are now for that type of racing ported to 280 cfm are being shifted at 6000 to 6200, and both of these motors are running heavily port single plane Intakes.
Just let a street 455 do what it does best, that being making big big torque that’s nosed over by 4200 which means making the 1-2 shift at like 5300 which will allow the rpms to drop right back into the peak torque cradle.
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