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Jeff, you know my answer! If you're willing to spend the money for high-compression 95's, spend a little more and get the 98's or 100's. You will be happier with the outcome. The advantage of 98's over 100's is that you can always stick the stock 95's back in if you ever want/need to. With 100's, you are committed.
You MAY be able to get away with single plug with 98's, but I wouldn't try it with 100's. While you have the heads off, have the machine work done (drill 2nd hole in heads and lower valve covers), you can always add the 964/993 distributor, Andial signal splitter and other ancillary stuff at a later date.
You may want to wait another week or two to decide as my 3.5L twin-plug Motronic motor will probably go on the dynojet late next week. We will also be running my buddie's 3.4L twin-plug Motronic motor at the same time. Both motors are virtually identical other then displacement and cam choice (964 for the 3.4L and 20/21 for mine). The compression ratio (9.5:1), induction (extrude honed plenums, overbored throttle body, etc), exhaust (1 5/8 headers with street muffler) and customized Steve Wong chip are identical in spec.
If his motor makes close, as much or more (perish the thought!) horsepower/torque, then obviously save the money and do 98's. If mine makes significantly more (cross your fingers) power/torque, then you may want to consider going with the 100's.
Will let you know the results when we do the deal.
Ralph
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