As long as they say "Safe for plastics" either of them should be okay. But having said that, I would try a few test sprays on the *outside* of the carb in an area that doesn't have anything attached to it. (Just bare plastic). Give it a spray, let it sit till it's all evaporated, then run your fingernail across the plastic. Does it feel hard and smooth or does it feel a little soft? If hard you should be fine. If soft go NO further.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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