Just got done putting on the new offy intake and holley 390cfm 4 barrel on my 250 and something seems wrong because I can't tell hardly any difference between my single barrel and my four barrel's performance. I'm pretty sure it's running rich because there's a bit of smoke coming out of the tailpipe. What jet sizes do you guys suggest for the primaries and for the secondaries? Would it running rich affect the performance this adversely?
