IMO, You will be much better off with 90's at the shock towers and steering column without stock heat shields. .
Here's a straight boot look at 5 & 7 from the top for a 440.

 

I ran 90's on mine with the wires under the headers run toward the front. much easier to keep the boots off the headers that way.

 

Of course. 90 at the tower or at the plug wont make a diff, but the header clearance the 90s give at certain cylinders with headers is golden.