I have worked on many Cobra replicas, most with FE power, and the expansion tank is very close to the belts and hoses in some instances.
The belt routing usually interferes with the radiator hoses though.
Often the belt slap at rpm will contact the hose, just scuffing it enough to prove contact without damaging the belt or the hose too much.
Unfortunately you will have to test fit the items to see where modifications are required.
It is very common to modify the tank mounting holes to move it just slightly for fittment issues.
There are also different depth pulleys and this can make, or break, a good fit.
Sometimes a specially made spacer (under each effected pulley) can get you the clearances you need.
Last, the belt width makes a difference too.
Poly-V belts (flat belts) usually come in widths ranging from 4 groove, up through 9 groove (for auto applications....(there are others for industrial applications)
Finding the right width belt can get you there too.
When fitting the belts for tight quarters be certain to know how much belt flutter/slap that particular belt length span will have.
The belts do not run perfectly flat between the pulleys when the engine is running...and RPM causes this to get worse.
Sorry, but this one is a trial fit issue that often comes with some custom modifications to get things just right.
Hopefully you get lucky and things just bolt up and fit and work....it does happen once in a while.