Back to the OP's question...
I have two local Mog pals with longstanding (from new) ownership of Plus 8's, one is a 1983, the other 1987, they both cover intergalactic mileages and each had engine rebuilds around 10 years ago by John Eales, one is a 3.9, the other a 4.6 that's been dyno'd at 297 BHP !
They are both hands on owners who self service and have had no significant issues with the JE engines
Personally, as many know I'm a Roadster owner BUT despite the V6 being younger I think there is better tech and parts support for the Rover V8 engines...and always will be
But, test drive each, they are quite different machines
