Thoughts on the 670 holley

Snake said
Timing is spot on and the clearance is .15 .

I hope you mean clearance is .015".

Ok, then off idle stumble, you have to notice if it bogs right away, or comes on and then bogs.

If it comes on and then bogs, you need a smaller squirter.

If it bogs right off, then install larger squirter, or increase cam.