Hey mate I'd be checking your advance weights to see if they have seized up. See what timing it's running at and reset if necessary (solved alot of problems for me). But it really sounds like your dissy isn't advancing far enough after 3500 you get a lot of noise but no go.
3inch exhaust is crap, stick with the stock size. If you want noise get rid of the resonator at the back and if you want more noise free flow the centre. The exhaust is too big it will cause you problems especially off road and it will effect what economy the disco has.
Have fun with the old girl.
Cheers Jim
Or you have pulled you button off too hard look up Lucas distributor shaft screw fix. Sounds like your gonna have to pull the dizzy out anyway, may as well do that screw fix also.
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