Edelbroock RPM head on a 393

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So i'd be better with the Air Gap RPM intake if i want to get a better torque/power curve. It's right on the RPM range i wanted. The Air gap on my 302 was perfect with those head.

Do i need to change the edelbrook valve spings and convert to stud type roller rocker if i want change for a bigger cam or can i keep the pedestal mount 1.6 roller rocker i have on my 302.

I have a goal of 450Hp and 450 Ft-lbs Torque and low 11sec at track. I will need better Transmision with that kind of power .