Assuming a stock (or close to it) engine:
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Originally Posted by Redog
........ My mech wants to use the HEI on the '68 ........
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He is probably not comfortable dealing with points.
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........ if the plugs that are in the 1985 ........ will fit the 1968 block ........
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They will not fit the block.
If you want to know if they will fit the heads, you can try to install them, visually compare them, or have your mechanic check his application guide.
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........ I know the gap will have to be .045 instead of the .032 for the points ........
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It will not. HEI was part of the '73 emissions package along with (among other things) lower compression, leaner mixtures, and wider gaps to fire those excessively lean mixtures.
Use the same plugs, and gap, that were engineered for your engine. More gap = unnecessary wear on the ignition system.
You will have to use more initial to get enough total advance and you may, or may not, have issues with the advance curve in the HEI.
Norm