Horsepower with mileage options

I've got a 1970 low mile j headed la360 sitting on an engine stand in our spare room. Lol. It's a concrete floor. Has a 4bbl aluminum intake and edelbrock 600 cam carb. It's ready to install, has a 727 trans sitting with it. So cost to find is zero. My son is welcome to use it in any project he wants. He has just been saving it for either the resurrection of his 68 fury or our 74 amc javelin. He just likes the idea of using the original engine in the valiant. Which is why he has been basing all the plans on the 318.