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| | | Forums66 Topics128,120 Posts1,056,325 Members48,439 | | Most Online14,466
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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | HEI is the way to go. 1974 and 75 are external coils, from thereon they were coil in cap. AFAIK the caps don't interchange. Since the HEI was designed for emissions All OEM HEI distributors to varying degrees limit centrifugal and vacuum advance compared to points distributors. That may not be a problem depending on what you want. A Pertronix would get around that or recurve the HEI.
Larry
I don't own a vehicle that isn't old enough to drink.
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