I CAN’T DRIVE 145mph

Some of these things you may have already done. I do not know your car

410 gears.

Ad a piece of aluminum between the lower valance and the front of the K member, Frame rail to frame rail

Close off the grille so it flows air between the valance and bumper

Aluminum Radiator and electric fan

raise the rear of the hood to let the air flow or buy the forbid-in cowl induction hood . And you can even raise that.

Now back in the day it started with raising the rear of the hood. Then the hood just got taken off. That started when someone couldn't get theirs latched. that advantage was the weight . I would just raise the rear of the hood for now.

But speaking of weight. Get in the drivers seat and imagine you are in a boat that is sinking. Now look around and start tossing all the extra things out the window. that are not needed to go racing. NOT the Beer! Question: If you drink the beer will you loose the weight.

Well that wraps it up. You need more motor , Make the body slicker trough the wind, or loose some weight out of the center to tail of the car. keep the nose weight or they take off. I have experience at that.

Your most expensive change would be the motor. Cam and just a little Boost.