Original 327 installed (which had never been touched so I went .20 over). I converted the Camaro to power power steering (I miss the Oregon junk yards - I remember one particular junk yard that had nine (67 to 69 Camaros) because that's where I got my power steering gear box and pump for less than $150). I also installed new body bushings on the sub-frame (six of them total), new shocks, coil springs, tie-rod ends, idler arms, ball joints, a whole complete front end "rubber" kit for upper and lower control arms etc... The list goes on and on. I traded in the stock power booster, plus some $ for a gold anodized one and replaced all the brakes lines on the front end.