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Re: 66 c10 engine upgrades
Oem HEI would be the best option for ignition.
Remove the stock mechanical fan and swap to an electric fan and shroud, I just did this on my '66 with a 250 and it made quite a noticeable difference in power and it's quieter.
The stock intake/carb is probably the biggest restriction, along with the mild cam specs.
There are parts/mods out there to make 300 hp out of a 250, just depends on how much you want to spend.
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