with Knowsnothing
the LD4B is a very good intake as well as the LD340 intake
I am running a LD4B on my teen and was a big improvment over the performer
the holley street dominator is another good intake for a mostly stock street 318 also
its a low rise,single plane intake that works with a spredbore carb and a square bore
I tried both and they worked great,but went back to the LD4B for better gas milage
a stock intake with a q-jet is fair to midland performance and is also over looked a lot
ditch the performer and the sp2p,IMO
the LD gets my vote hands down