I have a Max Vboost that is for sale and a Max rearend that could be sold or exchanged, The 1300 venture carbs are ther same size as the max. its just a matter of jetting. the 7500 rpm redline on the venture is low because of the low compression pistons. I have tried the Max rear on a 1300 venture and it works very well. If intrested contact me at the__toolman@hotmail.com