It is a BL a series engine 1310cc ( midget/sprite/mini)
head is just a rather normal 35/29 ported .
RC40 exhaust, maniflow freeflow/cooper header
cam is a 276 *0.290 lift symmetrical profile
Checking height: 0.016" @ lobe
Timing: (Intake): 34.5/61.5 (Exhaust): 63.5/32.5
Nominal lobe lift: (Intake): 0.290" (Exhaust): 0.290"
Duration (Intake): 276 (Exhaust): 276
Lobe centre angle (Intake): 103.5 (Exhaust): 105.5
Lobe separation angle: 104.5
Lift on overlap: 0.085"
carb is an SU HIF44 (constant vacuum)
the combination of parts is nothing special but it just does not want to play ball.
on the first chassis dyno session it was uncontrolably rich down low and uncontrolably lean up top.
Suspecting only fuel delivery problems I spend ages fiddling and fitted pump/reg and such and had it running decently for just driving around.
However , on return to the rollers it turns out the problem is still there and still huge.
AFR goes to beyond 7 down low to the point it bogs down and leans out up top.
nothing will cure this as it is impossible to get a needle to do this
after taking the air filter of it showed a large amount of standoff/spitback
removing the bellmouth (exponential one) it went from bad to horrific with clouds of fuel drfiting from under the bonnet. (blair was right about the exponential bellmouth). the huge fuel saturated cloud suspended in fron of the carb mounth causes it to go wildly rich...i can get that but how can it affect top end fueling?
i know what i am seeing.
I sort of know what is going on
I have no clue what can cause it
i have even less of a clue on what to do about it.
how far would the cam timing have to be out to cause this much grief ?
induction noise is very LOUD ( as in not legal for track use .. let alone road) and as i suspected there lot of energy there messing up the fueling.
i had a manifold fitted with larger and slightly longer ports and that seems to work a bit better but stupid me replaced it with the one we used before.
the exhaust is not ideal for this cam but could it be such a major factor?
any thoughts very very appreciate.
did anyone have spitback problemns with this cam on ..well ever..
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no time to finish me bleedin car ..
1982 Blue-White Roof.
http://aseriesmodifications.wordpress.com/
. If car is running good but you think it may be a little lean try a BAP needle this will give a bit more fuel right though rev range or go little richer and try a BBW 
with a very pointy tip.