Hood Clearance

I am starting a rebuild on a 318 in my 72 Scamp. I have a few questions
1) How much taller is an Edelbrock Performer manifold than the stock 2bbl manifold? Will I have hood clearance issues? I plan to use a thermoquad that I picked up.
2) The work that I am planning is the same that was done in a Mopar Muscle article. See the following link: 3-9-Teen Dream

I plan the following:
Competition Cams XE262H2
Edelbrock Performer
Thermoquad
Stock heads and pistons
Headers/Duals

According to the dyno, I can expect to up HP from 170 to 275. Comments?
Thanks