Header install into 75 ford truck

Installing Headman headers into my 75 Ford f250 Super Cab with a 429.



What is the best way to install?



With headers installed on heads while installing engine and tranny (tranny is a ZF-5)

Or

After engine is installed?

Also what are best gaskets and bolts to use?

Bob
Tucson

If the engine is out of the truck, lay the headers in place. Put a piece of wire or something to hold them in the area when you're dropping the motor in.