Purchased used 73 Alpine Skidoo, double track, single ski. Starts and will run with throttle wide open (kinda fun since 700+cc), floods and stalls if you slow down, worse when warm. Have put in new plugs, new carb kit, and second hand coils but problem still there. What next?

Also steers poorly, especially left.

What kind of carb is on it. It is most likely a carb problem.

If it's a tilletson then check the return line if it's plugged. Maybe the low speed screw is too far out, to check this just count how many turns in you can go before it bottoms out and if it's more then 2 then only turn it it out 1.5 turns and start it and adjust it from there. Also if it has the style needle where the arm attaches to the needle make sure the arm is adjusted right or the needle will stay wide open.
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If it's a mikuni then check the asjustment of you needle or put a smaller idle jet in.
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Could you fill out your profile please, like city, country, name etc. Just go to your "My Home" and click on "Edit" where it says "Personal information, email, password, etc." Thank You.