As for a 4 row rad that is not necessary a 3 row is a perfect rad for that motor I had a 4 row in my 71 and it was to cool now with the 3 row it is just perfect. I am running a 400 my build is!
Flat top forged pistons 20 over.
Mild RV cam.
Over sized valves. can't remember the specs.
9 to 1 compression.
High output oil pump.
Balanced fly wheel a must for 400 sb.
Now for the bolt on's!
Mid rise bowtie intake.
Shorty headman thermo coated headers.
2.50 exhaust w/ 40 sires flowmasters.
650 Edelbrock carb.
110 gph Edelbrock fuel pump.
Summit racing H.E.I. dist. 50,000 volt.
Heavy duty clutch fan.
High rise valve covers.
3" tall 14" around air filter.
I am about 425 or 427 HP.
Motor: 400 V8