1975 hornet electrical problems

[Teamamc <teamamc@xxxxxxxxxxx>]

Hello all,
            I have a 1975 2dr hornet . 258 auto with air tilt and cruise.
I replaced the cracked exhaust manifold yesterday.
After starting the car and checking for leaks I go to turn the car off.

Now as I turn the key off the engine shuts down. fine.
If I turn the key slowly. just before the key shuts the engine off and I
hold it in that position
the engine increases RPM'S.
if I move the key forward the rpms return to normal.
I could possibly live with this.
At present I have a 1980 Tilt column installed in the car from a concord.

NEXT problem is with no acessarys on just the engine running.
If I remove the positive battery  terminal the engine increases rpms
signifcantly.
(400-500) RPM approx.
If I have the lights on  and remove the positive battery post the rpms
increase a little bit. 50 RPM maybe.
When I swapped the exhaust intake I did replace the cruise control Rubber
Bellow as the old one had a leak.

It was 11.00PM last night when I  Finished.

Any quick clues  before I dig in .
Thanks
Bryan