Some input.
Rust. Check very very carefully. These were built before galvinized zinc coatings were used.
Motor. They are reliable if maintained right. Tuning. The Weber Carbs once synched by a pro, and preferrably a Italian mechanic with good ears, will stay synched. Mobelec I think used to make a ruggidized electronic ignition kit for Espadas that included a special rotor, special cap and a CD type discharge electronic system that replaced the ungodly factory expensive cap and rotors that would wear quickly. Besides not needing frequent replacement it was easier to set the timing and it stayed set. Crankfire will probably make you a new unit that will allow you to have a precision laser timer/ignition system.
Some owners had cooling issues. The standard radiator worked fine as long as the coolant was frequently changed and doing that with having the front wheels on small ramps and the rear wheels at ground level. The only way to get all of the old coolant out is by draining the car with the rear end of the car lower than the front. If you drain it on the level you will not get all of the old coolant out of the engine, radiator and hoses.
The original OEM radio was a Phillips am/fm/sw/casstette unit that had 6 or 8 SW bands! It looked really cool then. You can hide a newer digital radio with remote control in the car if you want to keep the original 70's look.
The two most dangerous areas for owners are the carburator linkage - wich left unmaintained can jam the 4 Weber 2bbl carbs wide open and kill you in a corner, and the electrical system for accessories. Both Ferrari and Lamborghini were notorious in that era for using wire too weak to handle voltage for things like fog lights and fans, and sometimes routed those wires near things that can burn - like upholstry. Also Stoptech in California can make you a new brake kit with better rotors and calipers for modern braking performance.
If you were looking at Lamborghinis on the West Coast of the USA, the two most knowlegable shops too inspect them are Bobileff in San Diego and one other one in the Santa Cruz area of whose name I forgot.
You should seriously consider locating a California car because of rust issues. It will also likely cost you less even with shipping as used exotics seem to be substantially cheaper in the US than in the EU. You can shop them at Hemmings.com for starters.
The Espadas drive nice. It was the fastest 4 seat GT of its era. If you have not seen one in person, the car still looks ok except for the rear side windows wich now look a bit over dimensioned. Back in the 70's I knew of two guys who used thier Espadas as daily drivers for years. They are actually built pretty well for a limited production vehicle and make very nice music when you step on the gas.
Good luck!