11.0:1 306 vs. 9.0:1 306

[Nitrous Al]

Chris, I'm going to be a PITA. The '02 Import cars are making about 200 hp with a naturally aspirated 2.0 inline four. That's about 100 hp per liter. So if I build my 5.0 306 motor with the same "tricks" I should see about 450hp to 500hp, right? I talked to a friend with a 10 second Mustang and he said to "Mill my heads to a get a higher compression ratio, install a larger cam and I could see another 50 hp." Is this correct? Any tips on making power NA? How are those Import cars making so much power?