What do you mean "deformed when pressed from the pump" ?
The pulley is hold by the 4 bolts that also hold the fan. If you remove the bolts everything shoud fall appart.
Do you mean the disc that is pressed on the hub where the pulley is atached?
There are two ways to do the swap:
1. A short pump with a bigger pulley (runs slower to stop caviation) ask Tom Langdon or Patrick.
2. There is an adapter where you can use a original 216 pump (that is shorter anyways) and pully for the guys that want a 216 looking 235 becaus of the vintage look. It apears often on ebay.
And you should read this - it probably answers all your questions:
http://www.chevrolet.com.au/articles/engine_swap.htm have fun, Frank
