[bp944]

I'm working on blueprinting a GM LS engine for my porsche 944 that will become my track car. I haven't been able to find something close to what I'm doing but please link me to a similiar build. I don't want to repeat questions and waste people's time. I'm building the engine from the ground up and would love to hit 400 rwhp but still maintain 35mpg. I do not want to use a turbo charger or NOS. As of right now, I want to build the engine as efficient as I can for this power and then see where the mpg ends up since there are many other factors that matter. I'm just going to go ahead and ask too many questions.
1-Does lightening internals actually better gas mileage (about 10 lbs lighter)?
2-Should I go with a 5.3, 5.7, or 6.0L engine?
3-I assume higher compression is a must?
4-Higher flow heads give one a better gas mileage or not?
5-Larger fuel injectors use more fuel so they must weaken mpg?
6-Does one want to shorten the stroke or lengthen it?
7-Does the piston shape (dome, flattop) have any effect on mpg?
8-What exactly is the best hp curve to aim for with a cam? Should it be a very smooth curve or peaky? Does one want a low hp at low rpm so it uses less fuel?

Thanks for looking!

P.S. If one is interested more in what my car plans are. I'm swapping a GM engine into a porsche 944 with a 944s transmission. I'm stripping the car down and building it back up, eventually. Fiberglass panels, new carpets and sound deadening, racing seats, roll bars, and rebuilt suspension. In the end, I'm hoping for a car that weighs in around 2600lbs since it weights 2900lbs currently. I'm aiming for the irrational but I'm hoping it'll happen. I'd love to have a daily driver that gets around 35mpg, 400 hp, and can still be an aggressive track car.