I have a standard 2 litre pinto with twin 40 dellorto on a short manifold,standard dissy with aldon electronic ignition.I'm using unleaded fuel.
What should I set the timing at .

I assume you are running with the vacuum advance disconnected?

You should be running at about 10 to 12 deg idle advance with a std pinto running on unleaded if my memory serves me correctly. With a maximum of 38degrees mechanical advance, all in at 3500rpm. Assuming your engine was designed to originally run on leaded then it will give too much advance when you have adjusted the idle advance to 10-12. This means you might need to modify the dizzy a bit. Theres some info here:
http://hometown.aol.com/dvandrews/timing.htm

David

As David says approx 10 deg with std cam. i managed to get a snazzy timing light off ebay with advance setting for about £30. They are great for dabbling with timing. Make adjustments very quick to do and you can play about with it to get the optimum setting for you.

In my experience as soon as you go away from std the std settings no longer apply - hence why so many favour good rolling road tune ups.

Ive got 285 cam, set it to 28deg at 3,000 revs for now and its somewhere near. Will tweak later when i get megajolt installed.

as far advanced as you can till it pinks, then back off a bit

last post is EXACTLY right!

There is no setting that anybody on here can give you for your particular setup.

I presume if it's an Aldon dizzy it has been re-curved (different weights and springs) for a lightly cammed pinto, in which case the advance curve should eb something like right (that's the tricky bit!) so you just have to get the base timing right, which, exactly as was said, relies on hearing pinking.

Set the timing such that everything feels right and runs cleanly, then mark the dizzy location accurately, and drive up the road, give it a bootful at low revs in top gear and listen for pinking. If it doesn't, then advance it a touch and try again until it does. Once you have slight pinking under load at lowish revs (2000ish, or 3000 if it feels like it comes on cam at that) in top gear then back off a fraction and leave it at that.