[25stevem]

Both of you converting over to the later heads for you 389s will also need to run the later 9.130” long push rods, as the ones from the 389 will be too short.

These will make for a drop in deal, but if your using a non factory cam you should check the geometry to pin down what length you might need to order.

If you cut one of your old 389 push rods in half and tap it out for a 6/32” stud you can make a adjustable one to make your checks with.

If your running longer then stock valves then for sure you will need longer then 9.130” push rods .