all good stuff guys - thanks.
my jag diff is the 2.88 variety that was on the V12 cars, because i decided toploader on the original, so toploader for me. no turning back now - my chassis has mounts for FE+toploader welded on. im aware of the advantages of the 5th gear, but i think people usually have a 3.3+ diff when they fit these 'boxes? so its kind of swings and roundabouts? overall im hoping for only a smallish increase in rpm when im cruising compared to say TKO and shorter diff. hopefully the secondaries wont be open much then. If caught, in the uk, 85mph will get you 3-6 points added on to your licence (12 points =banned for a year). but plenty of us touch these speeds for short periods
official national speed limit = 70mph.
yeh, i was mainly thinking about buying turn-key for the engine if i can - there is less local FE knowledge/resources in the UK (compared to say SBF/SBC), and ive read the warnings about needing to know what you;re doing with these engines - ive never rebuilt an engine.