I used the Power master 9523 on my engine. Member Dayclona recommended it to me. The wire studs are close on my world block but do clear. The clockable feature really did nothing for my application. One position put it into the block and another position put it into the tti headers. So I used it in the original position it came out of the box in. The starter has been great so far it spins my 528 Hemi over like nothing.