I have had these sitting on a shelf in my shop for a while. The Mopar X, O, J and U head castings all flow close to the same in stock form. These came off a 360 and were upgraded to 2.02 intakes before I acquired them. They came off of a running 340 motor which is now in my Dart. Of course they will need a complete disassembly, cleaning, valve job and check out of guides, and surfaces. One spring retainer is cracked. Local pickup only. I dont know anything about the springs except that the motor had a Hughes performance flat tappet cam. I am at zip 77583 which is 15-20 miles south of Houston TX. $225.00 Thanks FABO
