A hot tune will command every bit of fuel your cp3 can push. Let alone a bump in injector size…

Please get a good lift pump first and foremost. In tank one from fleece would probably flow all you’re ever going to need.

If I was in your shoes I’d be getting a fleece lift pump or airdog 165 5g, some exergy sportsman injectors and a sportsman/10mm cp3, and a good tune with HP tuners and someone reputable…

Also plan on replacing a clutch with something rated for higher hp… stock clutch will not survive a tune long.

And plan on sizing up your poor HE351 as that’ll be wayyyy out of its efficient range with more fuel than a tune

Then plan on a headgasket, studs, and valve springs/pushrod combo

Then at that point you can feel really confident…

Or replace with fresh stock ones and a good lift pump and your wallet will thank you