The 72 and up big blocks had a maxium of 180HP,a completely useless motor for performance.Its a great motor if it is to be use to rebuild it to 69-70 specs and toss most of the internals and install the good parts,pistons,valve train,heads,intake carb,etc.I have a few 72-78 motors with well over 500HP in them and no problems,and I beat the piss out of them.Just know that its a complete rebuild unit,as this motor in stock forum makes the same power as a the average 318,put the money into it and enjoy it,mrmopartech