I've played with classic cars for a long time, and preserving them is one of the biggest challenges.
The main isues with laying up a car, or using it very little, seem to be:
Condensation in the petrol tank rusting the empty bit of the tank...not a problem in the Vee.
Petrol with ethanol deteriorates in a few months, and can gum up injectors if engine not run. More of a problem with carburetors and old fuel lines.
Acids and condensation in old oil can corrode bearing surfaces. Not a problem if oil changed frequently, and engine run up to temperature a few times a year.
Coolant / antifreeze looses it's anti-oxidant and coolant properties after a few years...often forgotten when a car isn't on the road getting 'proper' services, and leads to oxidisation in aluminium blocks, heads, radiators, heaters and water pumps.
Rubber parts take on their rested shape when not used for a while. That includes bushes, belts and tyres, all of which may have to be replaced if left static for a long time.
Hydraulic fluid is hydroscopic (absorbs water from the atmosphere) which can oxidise hydraulic systems, causing pistons to seize in the master cylinders, callipers and servos when not used. Also, rubber seals in hydraulic systems can take on a fixed shape when not used, and are more prone to failure when being used after a long rest.
The stored environment is much more important when the car isn't used, especially in our damp climate. Aluminium parts can oxidise very quickly when exposed to damp air, and using a car will 'dry' it all out. Brake discs and flywheel / clutch can rust surprising quickly as well. Using the car 'airs' everything.
The best way to store the car is in a forced-air chamber (carcoon or something like that), running it up to temperature once a month. Move the car as well, even if it's just a few feet in and out of the garage. Make everything work, like the air-con, power windows, heater, lights, brakes, power steering. Spray the metal bits underneath (not discs or callipers) with a protective oil like Scottoil.
Or use it!
Mark