welcome to the shop dne' - the 230 would be non-original for 59, so you'd fix it with more patching, but done better than the person who swapped engines - the other possibility is to find a 235 or small block and do it the proper factory way .... I wouldn't drive it with only one mount in the front - also looks like the fan may be too far back from the rad, if so it'll overheat
Bill
