Why are 318's low HP and torque?

Chryslerkid said
Will someone please tell me the HP and TQ of a stock LA V8 318 engine from 1987 out of a dodge van with a 2bll carburetor? No aftermarket parts. Thanks,

My books show either a 145/150 net HP rating or a 170 net HP rating.

Not sure what the difference is or how to tell.

...and remember crate engines and magazine builds are gross HP rating.