@DannyP posted:My ultimate (possible for me) aircooled engine would be twin plug, EFI, with coil-near-plug sequential injection AND ignition, and be 2276cc(82 x 94) with Nickies or JPM cylinders and JE forged pistons at 11:1, with an 86B and 1.5 rockers. Still NA, no turbo. And of course valve seals, piston squirters, and dry sump, natch, because @Stan Galat. Pretty much what I have with 4mm more stroke and more compression and MORE...
With respect to sequential, it requires a cam position sensor. If building from scratch with a new case, It has to be possible to put a wheel/sensor on the cam gear.
With a little time and patience for setup, I'm sure I could build a STRONG jig of steel that would enable positioning a head for that second plug drilling/milling/tapping. Simply clamp the head and clamp the jig to the mill table.
You're most of the way there, Danny.
If your engine is 94 mm x 78 mm and it runs 10.2:1 CR, then an increase of stroke to 82 mm using the same everything else yields 10.6:1, which is what I was running in my twin-plug engine.
All else being equal, you've got a better cam and I believe your heads are better as well (which I hope to correct if we can ever ship anything with confidence again). If you really want 11:1, just fly-cut what you've got a bit.
I've driven your car with haste and malice. I don't think you are leaving much on the table right now.
Also, regarding a cam sensor: