Dominator spacer ?

Hey guys.Question on spacers.Im running a 1050 dominator on a 416 stroker.Im using a ported Indy intake on a set of ported W-5's.Too keep the cost down i didnt have the intake modified into a 4500 flange,just used a 4500/4150 spacer adapter.Being two inches tall though with a 4 inch air cleaner there is no way it fits under my six pack hood.I also have a 1/2 spacer/adapter.Will it kill performance by stepping down to the smaller spacer?If it doesnt i'd like to down size.Its crazy huge right now all stacked up.Thanks.
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