318 running with low power - dyno

'Output'

RWHP ........ 160 HP @ 4800 RPM's
FWHP ........ 205 HP @ 4800 RPM's

A basic 1975 '318' only puts out about 175 to 180 HP at the Flywheel.

There are some 'basic' tweaks that can be done here, to get the
Horsepower up.

What 'Valve Springs' are on the Cylinder Heads ?

I see that you are running with a Comp-Cams XE-268H. That is a very
good Camshaft.

Lift ...................... .477" / .480"
Duration ............... 268* / 280*
Duration @ .050" ... 224* / 230*
Overlap ................ 54*
LSA ...................... 110*
Centerline ............. 106*

That Camshaft is designed for some better Compression, and works
well in the Middle and early-Upper RPM range.

And that is the 'area' where you are 'falling-off-the-cliff'.