Ok, I dydno'd a 360 with the mods listed below, I feel it is alittle low for my setup, I dyno'd on a dynojet.

stage 2.5 heads w/portmatched intake (outflowed tea's)
comp springs
comp 230/236 @112 lsa
comp 1.6 rr's
compr lifters
comp pushrods
csi water pump
cloyes timing chain conversion
jethot longtubes
offroad y-pipe
capped borla (was told that uncapping wont make much difference)??
2600 stall (swapping to 3000 this winter)
built 4l60e
3:73's
k&n fipk
msd ignition
ngk tr6's
All the free mod's
30lb svo injectors
tuning is "dead-on"

I now have a stock fuel pump that I am swapping out to a 255l,
I ran out of fuel pump at about 6k, I want to take it to 6200rpm
I have heard that a bigger throttle body wont make much difference??
Will underdrive pulleys help much??
What do you guys think?

 

Yes get pulleys..
Yes opening borla should help also.
And good tuning makes big difference..

 

who did the heads and what did they flow. You are down on power compared to your mods.

 

Opening up the Borla will help. On a heads and cam car, a bigger throttle body should help some, it wouldn't on a stockish car (maybe that's what they meant).

 

open the borla (full) and get an ASP underdrive pulley. a bigger TB will help in your application INMO. work on tuning a little more too

 

Loyd did the heads and they actually outflowed the tea's, So I dont think that is it, FLP did the tuning and the air/fuel ratio is dead-on, So I dont think thats it.
I would think that I should be more around 400 rwhp for my mods.
I am not sure what to do next?