I have a 400cid small block in my 76 K5 with 87,000 miles on it. What all is involved in building a monster 406 out of this motor. I've built pleanty of SBC's, but not any 400's. Anything too be aware of ??? I will be going to better heads, Steel rods, and a steel crankshaft. Probley around 10.0 to 1 compression. Should I go with 5.7 or 6.0 rods ???