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Wow, quite an undertaking. I had an '81 El Camino and wish I had never sold it. Originally it had a 267 c.i. V-8 with a Rochester 2bbl carb. I put in a Chevy 350 4-bolt main crate engine, Edelbrock intake and carb, and Hedmann headers (it ran like a scalded dog LOL). My advice is to look for a Haynes manual covering the '71 model year. They have complete wiring diagrams in their manuals, but the wire routing will be up to you. Good luck.
most likely a weak fuel pump or a clogged filter. Check fuel pressure with a gauge or as its bogging down spray brake cleaner in the Throttle Body. If this allows it to increase RPM then its the pump or filter.
my car is choking and dieing coming to a stop its a 81 elco wit 89 tuneport motor vinf i changed the throttle pisition sensor /egr valve/sender/the owner said he change the fulepump. i notice a few times not all the time wen u rev the motor and let off the gas the idle drops then sets itself? and wen u put it in drive to take off if u hit the gas it hessitate a little? i need some help!!! marvin