P/S help

[70stroker]

Alright guys the truck im working on is a 70, but i need you square body guys help.

the truck has a 454 bbc, the p/s pump im using is a 75-78 truck pump and resivoir. I had this pump on my small block a few years back. I just now bought my bbc bracket and with the pulley i was using with my small block all the way pressed on it is still shy of about 1/4 inch of were it needs to be.

can anyone tell me what pulley i need. its a 454 with a 76 pump and a long water pump. thanks