Just Picked bought this clean 80 Chevy

[LT7A]

I think your truck looks great as it sits. I get the rake idea though. One thing to note is that the wheel opening in the front fender is cut higher than the opening in the rear fender. It looks that if you measured from the height from the center of your front wheel to the fender lip and compared it to the back, that they would be very similar measurements. If they are, you already have a rake but it's a subtle one. Honestly, I like that subtle rake the best where that dimension is close to the same, i.e. the fender lip "lands" on the same place of the wheel/tire front and back. It seems that the shackles and spring hangers would be where to get small adjustments if you needed to change the rear ride-height. Good luck!