/Evo80 ... So be sure to carefully check air cleaner-to-hood clearance before dropping the hood. A good trick is to roll up a ball of aluminum foil and place it on the top of the air cleaner. Gently lower the hood and close it. The foil will flatten out. Open up the hood, check the now-flattend foil ball. That's the clearance you now have.
Just went back and re-read your post again. You left the link for the Edelbrock engine, so I'm assuming that you are looking at that engine.
IMHO, that seems a bit expensive considering that the GM ZZ4 directly from GM Detroit is only about $3500, and produces more HP and much more Torque. Considering the $1300 difference in price, I'd go with the ZZ4. BTW, the ZZ4 is rated at 355hp and 405ft/lb torque. More HP & torque for less money going with the ZZ4. Plus a 1 year / 12K mi warranty. Hmmm..... And your current 750cfm Q-Jet will bolt right up and work just fine!