Spicer 1310 split U Joint.  Came off of a 455 Olds Berkeley Pump set up. In great shape joints move freely and easily.    Check out link below to purchase.  $125 or best offer

http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=264723151601&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg&toolid=11111

https://www.ebay.com/itm/264689893499

Hardin Marine 455 Olds Jet Boat Water Pump/jacket Cover. Condition is Used. Water pump cover is in good condition. No issues.

New to the site.  Been looking for a good jet boat forum like I have with my Supra boat and looks like this is the place.

Jet Boat newbie.  Rebuilding a 1973 CeeBee Avenger Mach III. 

Question:  I have rebuilt my Berkeley JC-A pump and just bought another pump.  The one I just bought very cheap has a stainless impeller in it.  Previous owner said his engine didnt have the torque to turn the stainless impeller to the proper RPM.  I was going to continue my build with the aluminum A cut impeller I have but now I am wondering if I should use the stainless impeller to complete it instead. 

I am building a 468 BBC for the boat which will be built to have some high torque at lower RPM and HP of around 500 at about 5400-5500 rpm.  Am I better off with the aluminum A or should I go with stainless?  Or run them both?  Does the stainless require a different wear ring? Some said that I have to get it balanced, is that the case?  I think the HP rating is right on the line for when to switch over to stainless.  Over time I will probably build on the motor.

Thought I was just going to part out the pump and sell the impeller but now thinking I should hang on to it.  Again, pretty new to jet boats so I appreciate any insight you can provide.

thanks
Dan