1964 Plymouth Valiant Leaf SPring Relocation Kit, How big of a tire can I go ?

Thank you
Can you measure the width of the stock rear wheel well. I wondering if it is the same wheel well as a early A Barracuda. I have the full relocation kit. I did try the offset hangers but found I needed another 3/4 so my tires would not hit the spring but are able to take full advantage of the width of stock wheel well. I am running a 275 40r17 on my car in the stock wheel well with the springs moved in. This is on a 65 Barracuda. As the guys said above, if you put in a mini tub you could go even wider.
Thank you for your response, Honestly I will be happy with 255s to 265s so if you are running 275s we should be in good shape. For good measure I will double check the measurement of the wheel well