I am trying to figure out if I should swap intakes before race season starts. Current set up 400sb, 5.56 rods, Extreme cam .507/.510 1.6 roller rockers, 215 Iron Eagle heads, TH350 3000 stall, 4.11 gears. Ever since I have had this motor in the car it has stopped pulling at about 5200rpms. So I don't turn it harder than that. I currently have a Vic JR, on the car, and a Holley street dominator (high rise dual plane). Both intakes have been gasket matched to felpro 1206. Last season I was pulling 1.85 60ft's with the St dominator (NOT gasket matched), changed to the Vic Jr (gasket matched) and consitently ran 1.84 60 fts.
I have not tried the St Domminator since I have gasket matched it. What do you think?

 

Leave the intake alone.

Put new valve springs on it.

 

Now that you mention it they are 2 yrs old. Plus I have a new set in the garage.