So the 355 i bought from a co worker he said it had a single plane and vortec heads it does have 292 cam that was the only thing he really has he said he had it built by a builder but lost the build sheet he probably only remembers the cam he got for it, what it really has is a jegs single plane and some performance heads.

But my question is why i don't feel as much tq from the new motor with that cam and dual plane im thinking it may be my stall is to low for that motor what do you think?

 

When running a "bigger" cam and a single plane intake, your RPM band gets shifted higher. You might be making both MORE TQ & HP, but this happens higher up in the rpm band. BTW, (I'll keep this just SBC engines), most have an rpm band of 4000 rpm.
Say the stock combo was probably good from idle-4500 rpm with TQ (what you feel in the seat of your pants) peaking at around 3000. Your combo could be 3000-7000 rpm with the TQ now peaking at 5500. So then off the line WILL feel lame because this new combo probably has half of the TQ your stock engine was making at 3000 rpm. The higher up in the RPM band you go, the less STREETABLE the engine becomes - AKA race car driven on the street.

 

oh okay thank you, im thinking of a 2500 stall to help me out with that.