SUs or DGVs?

welll..... i had just ordered my k&n air cleaners and air horns from MSA 2 days ago, and today i went to pep boys to get some vacuum nipple thingys because i'm taking off my air pump. as i was leaving, this kind man in a 280z pulls up and wants to check out my 240. sooooo... i pop the hood and he was telling me that he has these webers from his 260 that he's giving away! so, moral of the story is: i have these weber DGVs with new linkages (but no manifolds) and the air cleaners on the way. should i just use my SU air cleaners and air horns for now (until i get manifolds) or should i send them back (anyone had to do this with MSA?) and save the $$ to get the manifolds? i know the trade-off here is power for fuel-efficiency, but what do you guys think?