Have a 70 Challenger that was originally a "G" code 318. I am restoring to be a "Tribute" RT with a 440, 4 bbl. The car came with A/C, Auto and P Disc. The built date was 7-30-70. I now have the body free of rust, with much new sheet medal, and at the body shop for final prep and paint. I have a choice of two 440's to put in it. Engine one is a 70 HP motor out of an RT Charger with 70K on. (miles doesn't matter as I will completely rebuild to just about stock) Build date is 8-8-70. Second engine is 73 440 non HP engine. Again, I will rebuild either of these engine with new forged pistons to the original 10.25-1 comp, very mild cam, stock manifolds, both intake and exhaust, AVS carb etc,etc.
MY QUESTION IS: should I save the 70 HP motor for my next project car that may benefit from a "correct date" and just built the '73 to all 70 spec's or use the 70 that was built about ten days before the car? Is this 6 to one and a half dozen to the other?

Thanks, DRB  

What do you plan to build next? that would ultimately decide if you should save the 70 block.  

Thanks for your reply Randy. I have several cars in mind. I have a 67 GTX, # matching car ready to hit the rotisery when the Chally is done.(that was my first ride) I would like to do a 70 RR. As you may guess, I am older (50's)and very well established in the automotive industry. I do almost all the work myself with a few friends. I just can't decide if it would matter to a buyer, that is if I sell it, which engine it had. I am partial to the 70 motor and would like it to be used to it's best ability. If that is in the Challenger, which is 100% the plan right now, so be it!

Thanks again for your imput