I have heard where guys that have mounted the FCR use the stock Z carb to box boot. I have also heard about how it won't work or it has fell aprt at inoportune times. I now have a solution to the stock Z intake tube.
GO to Home Depot and it the plumbing section look for what is called a fernco coupler
Here is a link to what they look like. Fernco coupler
Find the 1 1/2 to 1 1/2 coupler. Remove the band clamps from both sides. On one side trim off the little ridge that sticks up to hold the band clamp in place. put a lil weiner slider on this side and stuff it into the stock z boot until about an inch is the only thing sticking out. This will be a little bit of a fight but it can be done. on the other side I chose to champfer the inside for ease of install. Mount the boot to the box. Mount the carb to the head. Mount the intake boot to the carb. Clamp everything down and go roost.

