I'd get the converter loosened up and try again. Save the intake swap for later IMO.

I'd bet as soon as you mention it's a street car, most companies get conservative and build the converter on the tight side. I'd leave the street part out and just tell em your combo. I've run several types of converters in mine on the street and never had any problems...sprag, spragless, mech. diode, real loose, tight, etc.