Ok, here's the deal. I pulled a bronco 5.0 motor. rebuilt it and put mustang heads on it. the problem is the block is hydraulic flat tappet. the heads came off of an 87 mustang which is roller tappet. what length push rods do I need to make it work. regular ones are too short.

 

whatever length were in the bronco and if you are putting that motor in a mustanf with EFI you better make sure tha cam carries the h.o firing order or it'll run bad

 

Like "Mustang" heads are worth a damn to begin with...