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Originally Posted by abcfg
The reason I ask is that I noticed the hole in the intake manifold is larger than on the older, non vortec intake manifolds ive seen. thanks.
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The '91 will just be a standard small block distributor. It should be the small cap, external coil HEI. It should retrofit to any pre'96 Gen-I small block as long as you run the computer with it.
Starting in '96 with OBDII, the distributor intake holes were made smaller so that older distributors cannot be used in them. This is because timing in these engines, including static timing, is entirely controlled by the PCM. These distributors have a camshaft position sensor in them and can be installed only one way - they cannot be adjusted for timing.