there's many ways to layout the tank to make the cut for the FB to mount into...
Here's one of those ways... Set the tank up LEVEL (both directions) on blocks... I got lucky and found a piece of 3/4' plywood (48"x12") that wasn't bowed to use for this next step.... block up this piece of plywood(?) under the end of the tank to be cut... start the edge at the weld under the tank and let it stick out past the tank... this "table" has to be level (both directions) as well.. now you have to get creative and make something that will slide around on this table (square to it) that will hold a sharpie at your segment height (14" I believe you said)... draw the line from weld to weld around the bell end at 14" high by sliding this contraption around on this table ... now use the level to extend these lines from the weld into the CC however deep you want the FB into the CC ... to connect these two lines around the bottom of the tank is best done with a thin flexible metal rule... bend it around from mark to mark and draw the line...
I hope your not as confused as I am now.. LOL... I'm sure there are other ways.. probably easier ones ... just the way I did it ...
Here's one of those ways... Set the tank up LEVEL (both directions) on blocks... I got lucky and found a piece of 3/4' plywood (48"x12") that wasn't bowed to use for this next step.... block up this piece of plywood(?) under the end of the tank to be cut... start the edge at the weld under the tank and let it stick out past the tank... this "table" has to be level (both directions) as well.. now you have to get creative and make something that will slide around on this table (square to it) that will hold a sharpie at your segment height (14" I believe you said)... draw the line from weld to weld around the bell end at 14" high by sliding this contraption around on this table ... now use the level to extend these lines from the weld into the CC however deep you want the FB into the CC ... to connect these two lines around the bottom of the tank is best done with a thin flexible metal rule... bend it around from mark to mark and draw the line...
I hope your not as confused as I am now.. LOL... I'm sure there are other ways.. probably easier ones ... just the way I did it ...