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std efi is pretty **** if u want to moidify it

just wired up a haltech to an el ford v8

never played with std ford ecus on cars that old

the new ones like au onwards with obs2 diagnostics u can flash but that costs around 1000 bucks for a flash tuner from capa but thats not a proper dyno tune


so anyhting u do will cost u ****loads to do to the ford ecu
and most guys that just specialise on ford tuning are up the asssss

so put aftermarket and then u have more of a range of people to tune it

a haltech with wiring and labour and tune will be around 3g for a good one

and if yr v8 is an auto then yr stuffed cause the auto and engine ecu talks together

but with most ford efi ecus they are a pain to work with so throw them out

and go aftermarket

but to get any big gains like supercharger then u need ecu and ecxtra stuff

i can see it costing up towards 10g