turning up a b model cat motor changing afc diaphram

This 350 seems lazy pulling its self around. Ha ha ha lol. By turning the fuel screws that increases HP correct. Is it possible to turn a 350 upto a 425 ?? Or is it to much stress on it? Don't most engines have a range of HP you can set it at. I know guys with later model trk seem like they get them turned up for better power. Guess ill have to see about getting more out of this one or finding a 425 motor or trading up in the future.

 

I don't want a beast just want a bit more out of it. It's lacking now that's for sure.

 

It probably is me making it seem worse. I've only driven one other truck a 99 ih with a cummins ism set at 400 or might of been 370 with a ten speed it pulled better it seems thou. So I don't have much to compare too. How do I check the timing is there a spring or weights but I think its probably ok it pulls ok on flat road really just seems to fall off on the hills and at higher speeds.

 

I doubt its bad then because I have no smoke just little on cold start which clears up in a minute or so after starting. No smoke when I step on it pulling either. And I get good mileage around 6.5 previous owner got 6.8 just lacking power on the hills mostly.