Just another suggestion. On my red roadster, it's blown, I scratched and dug for every little bit I could get. This is what I did.
1. Reassessed the firewall
2. put an extra bubble in it for distributor clearance, I use the ones that look like a mag, diameter wise they are much smaller.
3. I used a electric water pump, they are shorter than a mechanical and you don't use a pulley, so you pick up a little more room.
4. Machined my lower blower pulley and alternator pulley and moved my alternator back to line up the belt.
I gained enough to build a shroud and electric fan. If you look at my cars I don't scrimp on parts or quality. My car still over heats in the right conditions. I'm on my 3rd style fan, 4th design fan shroud. What everyone on this site is telling you, is a real problem. Please take this the way it is meant, to help you.
Ken