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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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#77457 05/11/2007 2:59 PM | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | In 74-75 the factory used an HEI with an external coil mounted on the side cover under the AC. That was also the first years for the HEI. I've also read that you can't convert the later HEI to an external coil because of the indexing on the cap, don't know how true that is. You could install a Pertronix in your original distributor for HEI. Hope that helps.
Larry
I don't own a vehicle that isn't old enough to drink.
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