1/2" spacers, and it still will not fit under the hood. you will need to loose about 1 1/2- 2",for it to fit under your stock hood. i've tried this already on my cars....
68 cuda formula S 588" bb 5sp 70 CUDA CONVERT 500" 5SP (SUBLIME) 70 CUDA CONVERT 500" 5SP (PLUMCRAZY):TOO MUCH HORSEPOWER, IS ALMOST ENOUGH!