Shroud5

Nice job building your fan shroud! Looks like you have the problem pretty well taken care of now. Hard to see in the pics you posted, but ideally, the edge of the shroud should cover 1/2 of the width of the fan blades (half of blade should extend rearward beyond shroud).

As has been noted by a couple other posters...... You can also benefit from adding panels to force all the air that enters the grill area through your radiator. This can be done in several ways.

One way is to make a vertical panel that extends up to your hood and seals off the air flowing over the radiator and radiator support so that is must go through the radiator. I did this on the '56 Chevy in my avatar after adding a huge 4-row desert cooler crossflow radiator in front of the original radiator core support. In this case, what I did was to remove the metal piece from the underside of the '56 hood that was intended for this purpose and pop rivet it to the core support, leaving 1/4" space between it and the hood when closed. Then I bought some rubber pipe insulation at the hardware store (the round type that slides over 1/2" pipe), slit it longways and glued it to the top of the metal panel. Closed the hood and let the glue dry. When you stood in front of the car a couple inches away from the bumper with engine idling, you could feel the air being drawn into the radiator because it actually pulled on your pant legs.

Another way is to make a more or less horizontal panel that fits between the bottom of your upper radiator tank and radiator core support on either side, extending from inner fender to inner fender...... And extending forward to the top of the metal support holding the upper part of your grille. This will force the air through your radiator as well and may be easier on your car than doing it the other way.

Glad you got rid of the aftermarket flex-fan. Over time, the flexing of the flex blades can cause the metal to work harden and eventually crack. Fiberglass fan blades are even worse. Had a buddy lose 3 fingers many moons ago setting timing. He was power timing his engine around 3,000 RPMs with a timing light to check full advance when an aftermarket flex-fan with stainless steel blades (similar to the one you had initially) came apart. The blade actually cut his upper radiator hose in half and missed his head by less than an inch. We found it later stuck in the roof of his garage. Went partway through the wood decking and he had to replace a couple of shingles and some tarpaper underlay after the roof started leaking.

Hope this gives you some ideas,

Harry