fun indeed and Lucky with the weather...
+4 not so ideal , to low , had some severe bumps underneath , must check for damage....
cars must be before '75 or'80 if model exists before '75
normaly we drove our '70 BMW but waiting new Tilton flywheel ...so we changed to our +4 . '89 , normaly not even allowed. To young
to low, or suspension should be stiffer.
Also to turn 180° on those small mountain roads isn't that easy in a +4 , also no useble handbrake for sliding in the back ..

PS GTN not sold yet....