I'm buying a 68 SS Chevelle 4 speed with a 454 in it. The 454 is fine but I would like to know if replacing it with a 396 would make any difference in the value of the car because it will not be the original engine either? Also it needs to be painted so should I go with the original color or the one I like the best if that does not affect the value once finished? Last the proper SS stripe on a 68 goes in front of the hood, down the front fenders and continues past the door. My preference is the 2 stripes that go down the hood and on the trunk. Once again will that have a negative effect on the cars value once complete? Thanks for your inputs.