[burnin oil]

If the truck is a stick shift the flywheel can be a little difficult. Most of the aftermarkets are real pricey. The cheapest option is have a standard flywheel balanced with the rotating assembly or have the whole thing balanced neutral for using a standard flywheel and balancer. Once you look into the prices the neutral balance is the best way to go. That route will probably take some mallory metal to balance out, pricey, but gives you access to off the shelf parts. Even adding mallory metal would probably work out cheaper than a 400 specific flywheel. Some people say to use the balance plate sandwiched behind the crank but I have never been a big fan of them. Even if using one I would want the whole setup balanced with the plate.