You will have to change the entire steering linkage, the motor mounts, rearend, springs, and radiator. I also recommend changing the brakes. You will also definitly have to change the spindles, which will be the hard part to locate. If you can't find a V8 donor car, you can use the spindles from a 67-68 Mustang or 69-73 Mustang. With the 69-73 spindles they are beefier and you will have to use bigger bearings. With all the spindles you use you will have to use the brakes and oouter tie rod ends from that year. Just remember that the 67-68 spindles have a disc brake spindle and a drum brake spindle. If you use a drum brake spindle then you will need a disc brake conversion kit, if you use a disc spindle you can just use stock parts. The 69-73 spindles are the same for disc and drum brakes. I used the 67 spindles on my 66. But whatever spindle you use DO NOT use the original 6 cyl. spindle. IT WILL BREAK, they would often break with the weigh of the 6 cyl. if you put a V8 in it there is no way it will support the weight.