I have been running a 700R4 in my 70 wagon for over 41.000 miles.
So what is the problem with a 700R? I run a 3:07--12 bolt and the engine is a 468, like an LS-5, with a Q-Jet. Tires are 225 X 70R X 14".
It is my driver / cruiser. So far no issues with the 700R. But then again it has been in the wagon for 12--14 years & 41.000 miles.
The 4300 Lb. wagon goes down the road at 75 MPH, and the 468 is spinning at 1950 RPMs. I use the electronic cruise control a lot. The 468 gets 20 MPG on the I-State at 75 MPH. ( A/C not running, with A/C mileage go down 2 MPG.) I can live with 18 MPG, With 38 degrees out the center vent) For me it has been 41.000 ""SMILES""
,,,,,,,,,,, NO changes are in the works !
P.S. When I built this " Purpose Built Wgn. ", I did a lot of thinking , Then I got the wrenches out! Big Orange hunk of iron,, With LOTSA CUBES, Motor home cam, Equals Big TORQUE and low RPMs. ( Just like the NEW modern Class "8" road tractors). My 1/2 ton Silverado with the Alum. 6.2-376 cu. in. is a lot faster than than 90% of the B.B.s on the road today. My Silverado 6.2 spins 5800 RPMs with the A/C running. Its all STOCK and 4WD.
YES, The moden LS engines are the Katz Azz, No doubt.... For me I just like the look of that Big ORANGE hunk, Sitting between the fenders.
Do what makes you happy....... Life is a " one way " street, Enjoy the He!! out of it !