Trust me, 65 extra cubes is nothing to sneeze at. The reason the Max Wedge stuff needed to be spun up rpm wise to work was because it only had 426 CID of air to displace. 505 CID is gulping 79 cubes more air every rev so it will take much less RPM to keep the air in the induction system moving at the speed where it is efficient.

You can't buy gas that a stock Max Wedge would be happy on but a 505 at 9:1ish should make as much or more HP in a 3.23 gear happy rev range and all that extra torque that starts at just above idle will make it feel much bigger.

Just do it. You will have zero regrets.

Kevin