I have an 85 K5 that currently has a 305 w/4bbl. It has 218k miles on it and has never been rebuilt. I am starting to see fouled plugs on the 5 and 7 cylinder like the head gaskets are leaking and the valve seats are worn. Instead of rebuilding the motor, I want to drop a 350 in its place. What are the major components (aside from the engine) that will swap over? Do I need to change the electronics? Will all the sensors (oil pressure, battery, etc.) need any modifying? HELP!!!!