Replacing 250 c.i. with a 194 c.i. six

[PackMule]

Greetings all. I have a 1970 C-10 with a 250 c.i. six that I use to do odd jobs. I don't know for sure yet, but it looks like, through my own fault, that I cracked the block. The mechanic that I use suggested (if the block is cracked) that he drop in a 350 that he pulled out of an El Camino.

I want to be able to use some aftermarket parts that are currently on the old engine, (Offenhauser intake, Holly 500 cfm carb, Clifford Headers) so I asked if he could drop in a 194 c.i. six that he has there at the shop.

Would the 56 cubic inch difference in engine size make a big difference as far as power goes? I really like the old straight six engines and would like to stay with one. Any comments are welcome.