Edelbrock Thunder series 800 on 408 stroker???

Hate to break it to the guy in the video, lots of times too much transfer slot is a direct result of not enough initial timing. But I digress!

That off idle stumble too...

If he does have issues with pump cam to arm contact, that's something that needs correcting. If you open up the primaries a bunch, that can get you up on the ramp and past the initial transistion in the pump cam.