my biggest question is, will they pass a visual inspection, or are they completely illegal to have?

Next, by looking at the design of them, it seems like they would restrict a lot of flow when the cap was on, is this true?

thanks

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86 Z28 red,
originally LG4,
new 350,
non comp Qjet,
T-5 five speed with new clutch,
stock 3.23 gears, Edelbrock Performer intake,
crane 272H cam,
Accel 8mm wires,
Edelbrock performer cat- back,
Homemade cold/forced air intake.
KYB GR-2 struts and shocks.
Grant GT leather wrap steering wheel.
Sony X-plod stereo.
Optima 6x9's

Future mods:
NOS,
Edelbrock TES headers, hi flo cat.
4th gen interior
6 point roll cage
3.42 gears
hurst billet/plus shifter
Edelbrock STB
Telstar rims

cars i've beaten:
95' Avenger, 88 Mustang GT, 70' Mustang , 97 Dodge Ram, 94 firebird formula, 92 Mustang GT, 94' 3000GT VR4, 97' Accord Rice Rocket (just barely), countless many ricers....