I finally got around to upgrading the cooling system on this Vega.
https://youtu.be/zwBiIRybVgkParts list:
Radiator - Griffin Radiator 1-25221-X ClassicCool 26" x 16" 2-Row Aluminum Radiator with 1" Tube
Fan shroud - Summit Adjustable Aluminum Fan Shroud Kits SUM-380501-SH
Fan that didn't fit - Flex-A-Lite Wide Blade Flex Fans 1307 (It hit the lower pulley because I had a double groove on the crank pulley. It might fit a single groove pulley)
Electric fan - Spal 30100384 12" Straight Blade Low Profile Fan
Electric fan mount kit - Derale 13001 Plastic Rod Mounting Kit
Radiator hose coupler - Dewhel Aluminum Black Water Temp Meter Temperature Gauge Joint Pipe Radiator Sensor Adaptor Clamps 38mm
Temperature switch - Derale Single-Stage Fan Controllers 16730
Coolant Reservoir - RYANSTAR Universal car Radiator Coolant Tank 800ml Coolant Expansion Tank Overflow Oil Catch Tank Cooling Catch Bottle Reservoir Aluminum Billet Black
Water neck - A-Team Performance 90° Swivel Water Neck Thermostat Housing Compatible With Chevrolet SBC BBC Small Block Big Block Chevy 283 302 305 327 350 383 396 427 454 502 Black
I modified all the radiator hoses heavilyUpper radiator hose - Mishimoto MMHOSE-GM-5U Chevrolet El Camino (327ci/350ci/400ci/454ci) Silicone Upper Radiator Hose, 1968-1977, Black
Silicone radiator hose 90 degree elbow - Hiwowsport 90 Degree Elbow 4-Ply High Performance Coupler Silicone Hose for Auto with T-Bolt Clamp (1.5''(38mm))
Lower radiator hose - Mishimoto MMHOSE-GM-2L Chevrolet Chevelle (283ci/327ci) Silicone Lower Radiator Hose, 1965-1967, Black
T-Bolt Clamps - 1.75" T-Bolt Hose Clamp - Working Range 51mm - 59mm for 1.75" Hose ID, Stainless Steel Bolt, Stainless Steel Band Floating Bridge and Nylon Insert Locknut (51mm - 59mm, 2 pack)