Cure for lazy Magnum...Has anyone built a Magnum for 7k+ revs?

The only problem I see with a high rpm SBM engine in a streeter,is gearing it to work in your chassis.
Mostly, a cam to do that will trade away all your low-rpm torque, so the first thing you will need is a hi-stall tc so you can actually get moving.
Next comes the gearing; It is impossible to make this into a proper 2-gears to 60 mph streeter, And if it only goes thru the power peak once on the way to 60, you lose.
And the third thing is this ; with the 3000TC and the 4.30 gears and a regular torqueflite trans, it's gonna spin the tires right thru first gear and most if not all of second gear...... so yur gonna have to spend a wheelbarrow full of cash to try to do something about that.
And fourthly is cruising with 4.30s sucks.
And Fifth is all the friggin shifting; never a break from shifting.
Making her rev to 7000 is the easy part. Making it do that more than once only costs a bit more. Making it work in your combo, and living with it, well; that will take cash and dedication.
No matter what; yur gonna need an overdrive. Cuz hitting 7000 in first gear with 3.55s is not an option most would chose, mostly the tires just smoke all the way to 60/65 mph.

And for me the worst part is filling the gas tank every couple of hours.

For a streeter, what you really need is to go thru the power peak twice on the way to 60/65