Few things I found doing my LS Swap

[88Stanger]

I have a 1969 C10 that I built from the ground up, and in doing so i decided to do an LS Swap. I bought what was to be a 2000 5.3 and discovered it was a 2000 4.8. So, after a Crank and rod change out, I got a 5.3, bored .60 over, rebuilt stock heads, "Hot Cam", all new sensors, headers, PSI wiring harness and computer, "Corvette style" fuel pump, filter and regulator, stayed iwth Multi-Port fuel injection, rebuilt 4L60E tranny, converted to Hydro-Boost brakes with all WilWood stock sytle upgrade replacement disc front and rear, 3:42 posi rear gears.
So with all that said, i started with a Holley Sheet Metal (Sniper) Multi-Port intake and 92mm throttle body, rebuilt 24lb injectors. This intake would make a sound that resembles a bearing going out in the alternator. It was unreal. If you place your hand on top of the intake it would go away. The throttle was responsive, but not like it should be. The sound was a Harmonic resonance that i just could not stand, either could my tuner. So, I decided to change out to a Holley open style plenum with a 4150 mount (where the throttle body that looks like a carb could sit) but till be Multi-port. I also changed out the stock 24lb injectors for new Accel 36lb injectors that required conversion wires from the stock Mulitec injectors to EV1 injectors, and DAMN did that thing wake up! It is incredible. My personal belief is that injectors are main influence on waking the motor up.
So what i learned is this, The injector size is very important, so do not skimp (as i did) if you do ANY modifications to the engine. There are calculators out there that will help with what size to run. Also, i took the conversion wires and made them longer by 12" with solder, heat shrink and same size wire for the the injectors so that i could route the wires under the intake to clean up the look, with no issues to date.
My experience is that the swap i did was not cheap honestly, but for the run ability of the motor with Multi-Port Fuel Injection, so worth it. If you are considering the LS Swap, do the research, figure out your direction with what you want and budget must be considered because you can go from not much to oh you must be kidding me very quickly.
Hope this may help.