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The best plug gap is a question better answered by the electronic ignition vendor dependant to some extent on the coil used and the electronic switch and compression n fuel and other stufffff fff. That being said, often when an electronic ignition switch is used and coupled up with a high energy high voltage coil a wider plug gap is uded versus the old points n condensor ignition. Generally the electronic ignition and high energy coil allows for more energy to be expended across the plug gap to better initiate the combustion and the elec. ignition and high voltagd coil is capable of arcing current across that wider plug gap. Nowwwww w its often the case where an elec ignition might run say a 0.035 up to even 0.045 or more versus say 0.025 with the points n condensor stock ignition, so if the vendor doesnt offer plug gap recommendatiosn Id just experiment starting at around 0.035. The timing is again, dependant on RPM and fuel used n compression etc but if all else (compression n fuel n RPM etc) is unchanged from stock, I dont see where the timing would be changed much from what was best using the points n condensor. The point gap and cam and follower wear affects timing versus the elec switch where a magnet passing by the pickup coil is what triggers the spark and it dont change like when points wear. However, when adjusting timing using a timing light n rotating the distributor till she fires at a certain BTDC at a certain RPM, you can still get her to fire the same timing as using points. I think theres a general misconception that advancing timing is some sort of a cure all and performance gainer buttttt t its really dependant mostly on RPM and compression n fuel and too far advanced actually hurts performance and may even harm the engine. As far as HP versus RPM and timing I think the only way to tell for sure is to hook her up to a dyno under load n adjust the timing n see what happens. BOTTOM LINE the plug gap will likely be a lil wider (try 0.035 and 0.040 and up) but the timing would still be what it was before if youre still at the same basic RPM and fuel n compression. As far as "lugging" that occurs at a lil lower RPM and the distributors centrifugal RPM sensitive timing advanse ought to still work the same as with the old points as the base plate (where pickup coil replaces points) still rotates the same. Ol John T and all in Indiana NOT an IHC man but believe this to be true regardless, Im curious what the more expreienced IHC guys have to say????? ????
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