I’ve never tried one of the BLP bodies...... that being said, a 1.590” Venturi 4150 carb seems pretty big for a motor that size.
My ported old school annular 850, which has a similarly sized Venturi, requires a certain level of “finesse” on the throttle pedal to get a really clean hit.
If you stomped on it fast, it would act just like yours in that video.
