I think concentrating on the HP peak to the exclusion of the torque curve and the area under it is not what I want to do here. This is a road car with performance intentions which will be used in a variety of ways whether I am doing some relaxed cruising or freeway commuting if I am travelling sideways. Since the purpose is not exclusively drag racing peak HP is not as important as the curve. So winding it tight will happen, just not often witnessed by the authorities.

What I am missing is a dyno chart of the stock GX engine and also of the non-shroud port A15 for reference. Been searching for a while and have not found either one.

That GX cam in an A15 will respond similarly but lower in the RPM band. How the GX cam would respond to the tighter ports of the H89 head is an open question. Would the greater cylinder volume of the A15 and the smaller port volume of the H89 head translate to higher port velocity which might result in increased cylinder filling at off peak RPMs at WOT over the A12GX? How this particular package responds while winding up is really more important than the power peak at the shift point.

NA is the only option, although I agree with the virtues. I don't have time or money to mess with forced induction right now.

What cam is NZ_datto running in his A15? Just for reference. His dyno sheet from the Performance wiki page is nice and flat:
http://homepages.paradise.net.nz/grah ... s/db_images/db_dyno12.jpg

This is the most critical decision I have to make and I need more infos and stuffs and junks.

One example of the many interesting roads in my area:
http://www.pashnit.com/roads/cal/LittleTujungaRd.htm