The block would have to be a 109 block. The 84-85 heads are not threaded in the block enough and the pre 84's are a completely different deal all together. You have to have a 86-87 109 block. You can get a 109 block out of a natural asperiated car, but you would have to drill a oil drain tube hole in it and tap it. If you are going for cheap that is the cheapest way.