Due to the fact that I am old and have been around so much,,, I am on my way back ! I have a home built 1970- SS 454 ( 468 ) with factory A/C. Its a Nomad Wgn. My cooling system is a direct & perfect copy of the VO-1 or H.D. 1970 cooling system. Again I am NOT the sharpest knife in the drawer. FACT: If you copy the factory cooling system for your year chevelle with A/C. You will have NO cooling issues, WHY?
Why did I copy the factory system? My one owner LS-5 / M-22 has factory A/C in my 52 years of ownership it never got hot! SO>>>> When I built my 70 468 driver I did what Chevy did in 1970,,,, Can you guess what it WORKS. ALL rubber parts and pieces are in place, VO-1 core support, Copper / brass 4 row ( from a pontiac wgn.), 772 fan blade and a later model clutch from the Chevy store, 811 water pump, water and green whatever anti freeze. A/C converted ( by me ) to R-134, 38 degrees out of the center vent. I will fill it with fuel and on a hot day I will park it in the sun, Turn on the A/C ands let it run till its out of fuel and it NEVER gets hot. I am NOT againts any modern Alum. rads, or fans and such.
Now ,, It is your call on what to do! Thanx for your time........................ Bob