The best way to get the right answer to your question without getting the motor on a dyno, or the whole car on a chassis dyno is this.
Find a nice l long level stretch of road.
Get the car moving in high gear and once the revs are above 3000 rpm floor it.
Then make a careful mental note of the rpm where the revs stop rising fast.
That will be the rpm of peak torque and will be the rpm you should be making your shifts take place at.
Do this a few times to be certain of what your feeling and seeing on the Tack in terms of the rpm rising.
If your trans still wants to down shift above 4K rpm then disable the down shift cable or switch, whichever you may have.
Testing for the rpm of peak torque since your not on a dyno must be done in high gear.
Just note that your playing with fire here in terms of the stock rods and the 4.210” stroke of the 455.
For cruising rpm with the 455 you should try and keep the piston speed below 2500 fpm if your running the heavy stock pistons on the factory rods, problem is at 4000 rpm the piston speed is already 2800 fps.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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