Not sure what happened to the link
so below is a couple of extract from it.
While both engines are nearly identical, it is important to note the Interceptor version is superior to the two because of its modified cam oiling passage ways. The Magna version does not have these and can easily suffer from lack of oil to the cams (top of the enigine) reducing reliability. Kits are available to fix this problem for the Magna. If you buy a Magna (any size, 1984-1986), check to see if it has the kit installed, if not, try to find, buy and install one.
Complex vee-four motor carried by adequate chassis makes for plenty of good times. Alas, as little as 20k caused clutch, camchain, valve and camshaft problems - high cost servicing is the VF's biggest vice and neglect turns out even more expensive, as ultimately the main bearings start knocking. Chassis and brake rot not unknown. Some did 40k.
Like Blade says cost's to restore will be a lot and you will be very unlikely to break even should you sell it, but is its for the enjoyment then go for it.