You have one of my intakes, they are 80mm, like the afm.
Why do you want to block the pipe at the throttle? You want to test the vac lines and manifold too.
I usually just put a brass hose barb in the end, just let me know what size you need (they are imperial like all air fittings.) A bike pump won't cut it, you need a compressor to supply enough flow or the leaks will drop the pressure.
Has anyone pressurised the intake to over 40psi? I noticed the new silicone joiners compress and leak no matter how tight you do up the clamp, making funny squeak noises. (like blowing through a gum leaf.)