well the TPI intake and big cams is a mismatch. The intake tuned runners some 24" total tune to a low
rpm and are too small for high air flow. (power)
Get a short runner or siamese the TPI. Same with restrictive truck heads with small valves.
A big cam is a mismatch.
Turbo cams do not have a street machine idle.
You could be making a lot more power with less boost. Most of your gauge boost is pure head and intake passage restriction.