I agree with your shift point; not going above 6k. Try dropping by 200 rpms at and see if you pick up any mph, if not go back to 6k.
I run the AC Delco R43S in mine and the strap is right in the middle. I would try that or the comparable NGK plug.
On the advance, just make sure its not pinging. I can't imagine it would with as much stall as you are running.
Binding, I am not sure what you mean. I would probably have to feel it to understand it. When you put in the slide a links did you remove your driveshaft? If so, did you torque the U-bolt down to specs? Are the U-Joints in good shape?
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GJN
1968 Firebird 400
461
3,580 LBs
3.2k Stall
3.25
1.657 - 60'
11.637 @ 115.45
http://www.youtube.com/watch?v=dEqzw...e=user&search=
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