My fuel injection is the lousy Multi Port upgrade from the spider style. It might be an "upgrade" in GM's eyes but not mine. The long block was installed 3 years back from Jeg's, L31 crate motor. So, it's at least a flat top piston 350, 4 bolt main. The OEM fuel delivery starves the motor from what a 350 is capable of. My 92 GMC 350 had TBI and would run like a scalded dog with nothing but a K&N air filter. I am curious how I could retro fit a TBI system on my 98 to wake it up?