never attempted this one , but more than likely the 70 frame will not sit up inder the 55 body very well. The rear might fit ok, maybe a hair on the wide side, depending on what wheel you want to run, but I was thinking the front would be too wie for sure unless yourun a skinny tire and a stock ride height at least. The hours it would take to make that frame work well(well being the key word) would more than likely not be worth it. You can get an easy 500 for just a swb frame, part out the 70 and put the money toward a mustang II variant.