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Re: what motor should i use
The "Vortec" 454's are still older architecture with some modern upgrades. IMO its not worth spending the $$ for an EFI system to control them unless your doing it for a purpose-built reason (i.e. a tow pig, vintage dually, welding rig etc). Even built up, they don't make crazy power like you think of with custom-block big blocks (Dart and World blocks for example).
IMO, the 5.3 is such a great all around motor with potential for power and usability, I have yet to see someone regret the choice.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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